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<!DOCTYPE html><html data-githubContributorsUrl="https://api.github.com/repos/scala/scala3" data-githubContributorsFilename="docs/_docs/reference/syntax.md" data-pathToRoot="" data-rawLocation="syntax" data-dynamicSideMenu="false"><head><meta charset="utf-8"></meta><meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"></meta><title>Scala 3 Syntax Summary</title><link rel="shortcut icon" type="image/x-icon" href="favicon.ico"></link><script type="text/javascript" src="scripts/theme.js"></script><script type="text/javascript" src="scripts/searchData.js" defer="true"></script><script type="text/javascript" src="scripts/scastieConfiguration.js" defer="true"></script><link rel="stylesheet" href="styles/theme/bundle.css"></link><link rel="stylesheet" href="styles/theme/components/bundle.css"></link><link rel="stylesheet" href="styles/theme/components/button/bundle.css"></link><link rel="stylesheet" href="styles/theme/layout/bundle.css"></link><link rel="stylesheet" href="styles/nord-light.css"></link><link rel="stylesheet" href="styles/dotty-icons.css"></link><link rel="stylesheet" href="styles/filter-bar.css"></link><link rel="stylesheet" href="styles/code-snippets.css"></link><link rel="stylesheet" href="styles/searchbar.css"></link><link rel="stylesheet" href="styles/social-links.css"></link><link rel="stylesheet" href="styles/versions-dropdown.css"></link><link rel="stylesheet" href="styles/content-contributors.css"></link><link rel="stylesheet" href="styles/fontawesome.css"></link><script type="text/javascript" src="hljs/highlight.pack.js" defer="true"></script><script type="text/javascript" src="scripts/hljs-scala3.js" defer="true"></script><script type="text/javascript" src="scripts/ux.js" defer="true"></script><script type="text/javascript" src="scripts/common/component.js" defer="true"></script><script type="text/javascript" src="scripts/common/utils.js" defer="true"></script><script type="text/javascript" src="scripts/components/FilterBar.js" defer="true"></script><script type="text/javascript" src="scripts/components/DocumentableList.js" defer="true"></script><script type="text/javascript" src="scripts/components/Input.js" defer="true"></script><script type="text/javascript" src="scripts/components/FilterGroup.js" defer="true"></script><script type="text/javascript" src="scripts/components/Filter.js" defer="true"></script><script type="text/javascript" src="scripts/scaladoc-scalajs.js" defer="true"></script><script type="text/javascript" src="scripts/contributors.js" defer="true"></script><script type="text/javascript" src="https://code.jquery.com/jquery-3.5.1.min.js" defer="true"></script><script type="text/javascript" src="https://d3js.org/d3.v6.min.js" defer="true"></script><script type="text/javascript" src="https://cdn.jsdelivr.net/npm/graphlib-dot@0.6.2/dist/graphlib-dot.min.js" defer="true"></script><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/dagre-d3/0.6.1/dagre-d3.min.js" defer="true"></script><script type="text/javascript" src="https://scastie.scala-lang.org/embedded.js" defer="true"></script><script type="text/javascript" src="scripts/data.js" defer="true"></script><link rel="stylesheet" href="styles/staticsitestyles.css"></link><script>var pathToRoot = "";</script><link rel="dns-prefetch" href="//fonts.googleapis.com">
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<h1 class="h600">Scala 3 Syntax Summary</h1>
</header><!--
This page has a companion page at _docs/internals/syntax.md.
!! Make sure to edit both pages in sync. !!
reference/syntax.md shows the official Scala 3 syntax, without deprecated or experimental features.
internals/syntax.md shows the Scala 3 syntax as supported by the parser, including
deprecated and experimental features. It also gives some indications how
productions map to AST nodes.
-->
<p class="body-large first-p">The following description of Scala tokens uses literal characters <code>‘c’</code> when referring to the ASCII fragment <code>\u0000</code> – <code>\u007F</code>.</p>
<p>Informal descriptions are typeset as <code>“some comment”</code>.</p>
<section id="lexical-syntax-1">
<h2 class="h500"><a href="#lexical-syntax-1" class="anchor"></a>Lexical Syntax</h2>
<p>The lexical syntax of Scala is given by the following grammar in EBNF form:</p>
<div class="snippet mono-small-block">
<pre><code class="language-ebnf"><span line-number="1" class=""><span class="tooltip-container"></span>whiteSpace ::= ‘\u0020’ | ‘\u0009’ | ‘\u000D’ | ‘\u000A’
</span><span line-number="2" class=""><span class="tooltip-container"></span>upper ::= ‘A’ | ... | ‘Z’ | ‘$’ and any character in Unicode categories Lu, Lt or Nl,
</span><span line-number="3" class=""><span class="tooltip-container"></span> and any character in Unicode categories Lo and Lm that doesn't have
</span><span line-number="4" class=""><span class="tooltip-container"></span> contributory property Other_Lowercase
</span><span line-number="5" class=""><span class="tooltip-container"></span>lower ::= ‘a’ | ... | ‘z’ | ‘_’ and any character in Unicode category Ll,
</span><span line-number="6" class=""><span class="tooltip-container"></span> and any character in Unicode categories Lo or Lm that has contributory
</span><span line-number="7" class=""><span class="tooltip-container"></span> property Other_Lowercase
</span><span line-number="8" class=""><span class="tooltip-container"></span>letter ::= upper | lower
</span><span line-number="9" class=""><span class="tooltip-container"></span>digit ::= ‘0’ | ... | ‘9’
</span><span line-number="10" class=""><span class="tooltip-container"></span>paren ::= ‘(’ | ‘)’ | ‘[’ | ‘]’ | ‘{’ | ‘}’
</span><span line-number="11" class=""><span class="tooltip-container"></span>delim ::= ‘`’ | ‘'’ | ‘"’ | ‘.’ | ‘;’ | ‘,’
</span><span line-number="12" class=""><span class="tooltip-container"></span>opchar ::= ‘!’ | ‘#’ | ‘%’ | ‘&’ | ‘*’ | ‘+’ | ‘-’ | ‘/’ | ‘:’ |
</span><span line-number="13" class=""><span class="tooltip-container"></span> ‘<’ | ‘=’ | ‘>’ | ‘?’ | ‘@’ | ‘\’ | ‘^’ | ‘|’ | ‘~’
</span><span line-number="14" class=""><span class="tooltip-container"></span> and any character in Unicode categories Sm or So
</span><span line-number="15" class=""><span class="tooltip-container"></span>printableChar ::= all characters in [\u0020, \u007E] inclusive
</span><span line-number="16" class=""><span class="tooltip-container"></span>UnicodeEscape ::= ‘\’ ‘u’ {‘u’} hexDigit hexDigit hexDigit hexDigit
</span><span line-number="17" class=""><span class="tooltip-container"></span>hexDigit ::= ‘0’ | ... | ‘9’ | ‘A’ | ... | ‘F’ | ‘a’ | ... | ‘f’
</span><span line-number="18" class=""><span class="tooltip-container"></span>charEscapeSeq ::= ‘\’ (‘b’ | ‘t’ | ‘n’ | ‘f’ | ‘r’ | ‘"’ | ‘'’ | ‘\’)
</span><span line-number="19" class=""><span class="tooltip-container"></span>escapeSeq ::= UnicodeEscape | charEscapeSeq
</span><span line-number="20" class=""><span class="tooltip-container"></span>
</span><span line-number="21" class=""><span class="tooltip-container"></span>op ::= opchar {opchar}
</span><span line-number="22" class=""><span class="tooltip-container"></span>varid ::= lower idrest
</span><span line-number="23" class=""><span class="tooltip-container"></span>boundvarid ::= varid
</span><span line-number="24" class=""><span class="tooltip-container"></span> | ‘`’ varid ‘`’
</span><span line-number="25" class=""><span class="tooltip-container"></span>plainid ::= alphaid
</span><span line-number="26" class=""><span class="tooltip-container"></span> | op
</span><span line-number="27" class=""><span class="tooltip-container"></span>id ::= plainid
</span><span line-number="28" class=""><span class="tooltip-container"></span> | ‘`’ { charNoBackQuoteOrNewline | escapeSeq } ‘`’
</span><span line-number="29" class=""><span class="tooltip-container"></span>idrest ::= {letter | digit} [‘_’ op]
</span><span line-number="30" class=""><span class="tooltip-container"></span>quoteId ::= ‘'’ alphaid
</span><span line-number="31" class=""><span class="tooltip-container"></span>spliceId ::= ‘$’ alphaid ;
</span><span line-number="32" class=""><span class="tooltip-container"></span>
</span><span line-number="33" class=""><span class="tooltip-container"></span>integerLiteral ::= (decimalNumeral | hexNumeral) [‘L’ | ‘l’]
</span><span line-number="34" class=""><span class="tooltip-container"></span>decimalNumeral ::= ‘0’ | digit [{digit | ‘_’} digit]
</span><span line-number="35" class=""><span class="tooltip-container"></span>hexNumeral ::= ‘0’ (‘x’ | ‘X’) hexDigit [{hexDigit | ‘_’} hexDigit]
</span><span line-number="36" class=""><span class="tooltip-container"></span>
</span><span line-number="37" class=""><span class="tooltip-container"></span>floatingPointLiteral
</span><span line-number="38" class=""><span class="tooltip-container"></span> ::= [decimalNumeral] ‘.’ digit [{digit | ‘_’} digit] [exponentPart] [floatType]
</span><span line-number="39" class=""><span class="tooltip-container"></span> | decimalNumeral exponentPart [floatType]
</span><span line-number="40" class=""><span class="tooltip-container"></span> | decimalNumeral floatType
</span><span line-number="41" class=""><span class="tooltip-container"></span>exponentPart ::= (‘E’ | ‘e’) [‘+’ | ‘-’] digit [{digit | ‘_’} digit]
</span><span line-number="42" class=""><span class="tooltip-container"></span>floatType ::= ‘F’ | ‘f’ | ‘D’ | ‘d’
</span><span line-number="43" class=""><span class="tooltip-container"></span>
</span><span line-number="44" class=""><span class="tooltip-container"></span>booleanLiteral ::= ‘true’ | ‘false’
</span><span line-number="45" class=""><span class="tooltip-container"></span>
</span><span line-number="46" class=""><span class="tooltip-container"></span>characterLiteral ::= ‘'’ (charNoQuoteOrNewline | escapeSeq) ‘'’
</span><span line-number="47" class=""><span class="tooltip-container"></span>
</span><span line-number="48" class=""><span class="tooltip-container"></span>stringLiteral ::= ‘"’ {stringElement} ‘"’
</span><span line-number="49" class=""><span class="tooltip-container"></span> | ‘"""’ multiLineChars ‘"""’
</span><span line-number="50" class=""><span class="tooltip-container"></span>stringElement ::= charNoDoubleQuoteOrNewline
</span><span line-number="51" class=""><span class="tooltip-container"></span> | escapeSeq
</span><span line-number="52" class=""><span class="tooltip-container"></span>multiLineChars ::= {[‘"’] [‘"’] charNoDoubleQuote} {‘"’}
</span><span line-number="53" class=""><span class="tooltip-container"></span>
</span><span line-number="54" class=""><span class="tooltip-container"></span>interpolatedString
</span><span line-number="55" class=""><span class="tooltip-container"></span> ::= alphaid ‘"’ {[‘\’] interpolatedStringPart | ‘\\’ | ‘\"’} ‘"’
</span><span line-number="56" class=""><span class="tooltip-container"></span> | alphaid ‘"""’ {[‘"’] [‘"’] char \ (‘"’ | ‘\$’) | escape} {‘"’} ‘"""’
</span><span line-number="57" class=""><span class="tooltip-container"></span>interpolatedStringPart
</span><span line-number="58" class=""><span class="tooltip-container"></span> ::= printableChar \ (‘"’ | ‘$’ | ‘\’) | escape
</span><span line-number="59" class=""><span class="tooltip-container"></span>escape ::= ‘\$\$’
</span><span line-number="60" class=""><span class="tooltip-container"></span> | ‘\$"’
</span><span line-number="61" class=""><span class="tooltip-container"></span> | ‘\$’ alphaid
</span><span line-number="62" class=""><span class="tooltip-container"></span> | ‘\$’ BlockExpr
</span><span line-number="63" class=""><span class="tooltip-container"></span>alphaid ::= upper idrest
</span><span line-number="64" class=""><span class="tooltip-container"></span> | varid
</span><span line-number="65" class=""><span class="tooltip-container"></span>
</span><span line-number="66" class=""><span class="tooltip-container"></span>comment ::= ‘/*’ “any sequence of characters; nested comments are allowed” ‘*/’
</span><span line-number="67" class=""><span class="tooltip-container"></span> | ‘//’ “any sequence of characters up to end of line”
</span><span line-number="68" class=""><span class="tooltip-container"></span>
</span><span line-number="69" class=""><span class="tooltip-container"></span>nl ::= “new line character”
</span><span line-number="70" class=""><span class="tooltip-container"></span>semi ::= ‘;’ | nl {nl}
</span></code></pre>
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</section>
<section id="optional-braces-3">
<h2 class="h500"><a href="#optional-braces-3" class="anchor"></a>Optional Braces</h2>
<p>The principle of optional braces is that any keyword that can be followed by <code>{</code> can also be followed by an indented block, without needing an intervening <code>:</code>. (Allowing an optional <code>:</code> would be counterproductive since it would introduce several ways to do the same thing.)</p>
<p>The lexical analyzer inserts <code>indent</code> and <code>outdent</code> tokens that represent regions of indented code <a href="other-new-features/indentation.html">at certain points</a>.</p>
<p>In the context-free productions below we use the notation <code><<< ts >>></code> to indicate a token sequence <code>ts</code> that is either enclosed in a pair of braces <code>{ ts }</code> or that constitutes an indented region <code>indent ts outdent</code>. Analogously, the notation <code>:<<< ts >>></code> indicates a token sequence <code>ts</code> that is either enclosed in a pair of braces <code>{ ts }</code> or that constitutes an indented region <code>indent ts outdent</code> that follows a <code>colon</code> token.</p>
<p>A <code>colon</code> token reads as the standard colon "<code>:</code>" but is generated instead of it where <code>colon</code> is legal according to the context free syntax, but only if the previous token is an alphanumeric identifier, a backticked identifier, or one of the tokens <code>this</code>, <code>super</code>, <code>new</code>, "<code>)</code>", and "<code>]</code>".</p>
<div class="snippet mono-small-block">
<pre><code class="language-"><span line-number="1" class=""><span class="tooltip-container"></span>colon ::= ':' -- with side conditions explained above
</span><span line-number="2" class=""><span class="tooltip-container"></span> <<< ts >>> ::= ‘{’ ts ‘}’
</span><span line-number="3" class=""><span class="tooltip-container"></span> | indent ts outdent
</span><span line-number="4" class=""><span class="tooltip-container"></span>:<<< ts >>> ::= [nl] ‘{’ ts ‘}’
</span><span line-number="5" class=""><span class="tooltip-container"></span> | colon indent ts outdent
</span></code></pre>
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</section>
<section id="keywords-1">
<h2 class="h500"><a href="#keywords-1" class="anchor"></a>Keywords</h2>
</section>
<section id="regular-keywords-1">
<h3 class="h400"><a href="#regular-keywords-1" class="anchor"></a>Regular keywords</h3>
<div class="snippet mono-small-block">
<pre><code class="language-"><span line-number="1" class=""><span class="tooltip-container"></span>abstract case catch class def do else
</span><span line-number="2" class=""><span class="tooltip-container"></span>enum export extends false final finally for
</span><span line-number="3" class=""><span class="tooltip-container"></span>given if implicit import lazy match new
</span><span line-number="4" class=""><span class="tooltip-container"></span>null object override package private protected return
</span><span line-number="5" class=""><span class="tooltip-container"></span>sealed super then throw trait true try
</span><span line-number="6" class=""><span class="tooltip-container"></span>type val var while with yield
</span><span line-number="7" class=""><span class="tooltip-container"></span>: = <- => <: >: #
</span><span line-number="8" class=""><span class="tooltip-container"></span>@ =>> ?=>
</span></code></pre>
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</section>
<section id="soft-keywords-1">
<h3 class="h400"><a href="#soft-keywords-1" class="anchor"></a>Soft keywords</h3>
<div class="snippet mono-small-block">
<pre><code class="language-"><span line-number="1" class=""><span class="tooltip-container"></span>as derives end extension infix inline opaque open transparent using | * + -
</span></code></pre>
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<p>See the <a href="soft-modifier.html">separate section on soft keywords</a> for additional details on where a soft keyword is recognized.</p>
</section>
<section id="context-free-syntax-1">
<h2 class="h500"><a href="#context-free-syntax-1" class="anchor"></a>Context-free Syntax</h2>
<p>The context-free syntax of Scala is given by the following EBNF grammar:</p>
</section>
<section id="literals-and-paths-1">
<h3 class="h400"><a href="#literals-and-paths-1" class="anchor"></a>Literals and Paths</h3>
<div class="snippet mono-small-block">
<pre><code class="language-"><span line-number="1" class=""><span class="tooltip-container"></span>SimpleLiteral ::= [‘-’] integerLiteral
</span><span line-number="2" class=""><span class="tooltip-container"></span> | [‘-’] floatingPointLiteral
</span><span line-number="3" class=""><span class="tooltip-container"></span> | booleanLiteral
</span><span line-number="4" class=""><span class="tooltip-container"></span> | characterLiteral
</span><span line-number="5" class=""><span class="tooltip-container"></span> | stringLiteral
</span><span line-number="6" class=""><span class="tooltip-container"></span>Literal ::= SimpleLiteral
</span><span line-number="7" class=""><span class="tooltip-container"></span> | interpolatedStringLiteral
</span><span line-number="8" class=""><span class="tooltip-container"></span> | symbolLiteral
</span><span line-number="9" class=""><span class="tooltip-container"></span> | ‘null’
</span><span line-number="10" class=""><span class="tooltip-container"></span>
</span><span line-number="11" class=""><span class="tooltip-container"></span>QualId ::= id {‘.’ id}
</span><span line-number="12" class=""><span class="tooltip-container"></span>ids ::= id {‘,’ id}
</span><span line-number="13" class=""><span class="tooltip-container"></span>
</span><span line-number="14" class=""><span class="tooltip-container"></span>SimpleRef ::= id
</span><span line-number="15" class=""><span class="tooltip-container"></span> | [id ‘.’] ‘this’
</span><span line-number="16" class=""><span class="tooltip-container"></span> | [id ‘.’] ‘super’ [ClassQualifier] ‘.’ id
</span><span line-number="17" class=""><span class="tooltip-container"></span>
</span><span line-number="18" class=""><span class="tooltip-container"></span>ClassQualifier ::= ‘[’ id ‘]’
</span></code></pre>
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</section>
<section id="types-1">
<h3 class="h400"><a href="#types-1" class="anchor"></a>Types</h3>
<div class="snippet mono-small-block">
<pre><code class="language-"><span line-number="1" class=""><span class="tooltip-container"></span>Type ::= FunType
</span><span line-number="2" class=""><span class="tooltip-container"></span> | HkTypeParamClause ‘=>>’ Type
</span><span line-number="3" class=""><span class="tooltip-container"></span> | FunParamClause ‘=>>’ Type
</span><span line-number="4" class=""><span class="tooltip-container"></span> | MatchType
</span><span line-number="5" class=""><span class="tooltip-container"></span> | InfixType
</span><span line-number="6" class=""><span class="tooltip-container"></span>FunType ::= FunTypeArgs (‘=>’ | ‘?=>’) Type
</span><span line-number="7" class=""><span class="tooltip-container"></span> | HKTypeParamClause '=>' Type
</span><span line-number="8" class=""><span class="tooltip-container"></span>FunTypeArgs ::= InfixType
</span><span line-number="9" class=""><span class="tooltip-container"></span> | ‘(’ [ FunArgTypes ] ‘)’
</span><span line-number="10" class=""><span class="tooltip-container"></span> | FunParamClause
</span><span line-number="11" class=""><span class="tooltip-container"></span>FunParamClause ::= ‘(’ TypedFunParam {‘,’ TypedFunParam } ‘)’
</span><span line-number="12" class=""><span class="tooltip-container"></span>TypedFunParam ::= id ‘:’ Type
</span><span line-number="13" class=""><span class="tooltip-container"></span>MatchType ::= InfixType `match` <<< TypeCaseClauses >>>
</span><span line-number="14" class=""><span class="tooltip-container"></span>InfixType ::= RefinedType {id [nl] RefinedType}
</span><span line-number="15" class=""><span class="tooltip-container"></span>RefinedType ::= AnnotType {[nl] Refinement}
</span><span line-number="16" class=""><span class="tooltip-container"></span>AnnotType ::= SimpleType {Annotation}
</span><span line-number="17" class=""><span class="tooltip-container"></span>
</span><span line-number="18" class=""><span class="tooltip-container"></span>SimpleType ::= SimpleLiteral
</span><span line-number="19" class=""><span class="tooltip-container"></span> | ‘?’ TypeBounds
</span><span line-number="20" class=""><span class="tooltip-container"></span> | id
</span><span line-number="21" class=""><span class="tooltip-container"></span> | Singleton ‘.’ id
</span><span line-number="22" class=""><span class="tooltip-container"></span> | Singleton ‘.’ ‘type’
</span><span line-number="23" class=""><span class="tooltip-container"></span> | ‘(’ [Types] ‘)’
</span><span line-number="24" class=""><span class="tooltip-container"></span> | Refinement
</span><span line-number="25" class=""><span class="tooltip-container"></span> | SimpleType TypeArgs
</span><span line-number="26" class=""><span class="tooltip-container"></span> | SimpleType ‘#’ id
</span><span line-number="27" class=""><span class="tooltip-container"></span>Singleton ::= SimpleRef
</span><span line-number="28" class=""><span class="tooltip-container"></span> | SimpleLiteral
</span><span line-number="29" class=""><span class="tooltip-container"></span> | Singleton ‘.’ id
</span><span line-number="30" class=""><span class="tooltip-container"></span>
</span><span line-number="31" class=""><span class="tooltip-container"></span>FunArgType ::= Type
</span><span line-number="32" class=""><span class="tooltip-container"></span> | ‘=>’ Type
</span><span line-number="33" class=""><span class="tooltip-container"></span>FunArgTypes ::= FunArgType { ‘,’ FunArgType }
</span><span line-number="34" class=""><span class="tooltip-container"></span>ParamType ::= [‘=>’] ParamValueType
</span><span line-number="35" class=""><span class="tooltip-container"></span>ParamValueType ::= Type [‘*’]
</span><span line-number="36" class=""><span class="tooltip-container"></span>TypeArgs ::= ‘[’ Types ‘]’
</span><span line-number="37" class=""><span class="tooltip-container"></span>Refinement ::= :<<< [RefineDcl] {semi [RefineDcl]} >>>
</span><span line-number="38" class=""><span class="tooltip-container"></span>TypeBounds ::= [‘>:’ Type] [‘<:’ Type]
</span><span line-number="39" class=""><span class="tooltip-container"></span>TypeParamBounds ::= TypeBounds {‘:’ Type}
</span><span line-number="40" class=""><span class="tooltip-container"></span>Types ::= Type {‘,’ Type}
</span></code></pre>
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</section>
<section id="expressions-1">
<h3 class="h400"><a href="#expressions-1" class="anchor"></a>Expressions</h3>
<div class="snippet mono-small-block">
<pre><code class="language-"><span line-number="1" class=""><span class="tooltip-container"></span>Expr ::= FunParams (‘=>’ | ‘?=>’) Expr
</span><span line-number="2" class=""><span class="tooltip-container"></span> | HkTypeParamClause ‘=>’ Expr
</span><span line-number="3" class=""><span class="tooltip-container"></span> | Expr1
</span><span line-number="4" class=""><span class="tooltip-container"></span>BlockResult ::= FunParams (‘=>’ | ‘?=>’) Block
</span><span line-number="5" class=""><span class="tooltip-container"></span> | HkTypeParamClause ‘=>’ Block
</span><span line-number="6" class=""><span class="tooltip-container"></span> | Expr1
</span><span line-number="7" class=""><span class="tooltip-container"></span>FunParams ::= Bindings
</span><span line-number="8" class=""><span class="tooltip-container"></span> | id
</span><span line-number="9" class=""><span class="tooltip-container"></span> | ‘_’
</span><span line-number="10" class=""><span class="tooltip-container"></span>Expr1 ::= [‘inline’] ‘if’ ‘(’ Expr ‘)’ {nl} Expr [[semi] ‘else’ Expr]
</span><span line-number="11" class=""><span class="tooltip-container"></span> | [‘inline’] ‘if’ Expr ‘then’ Expr [[semi] ‘else’ Expr]
</span><span line-number="12" class=""><span class="tooltip-container"></span> | ‘while’ ‘(’ Expr ‘)’ {nl} Expr
</span><span line-number="13" class=""><span class="tooltip-container"></span> | ‘while’ Expr ‘do’ Expr
</span><span line-number="14" class=""><span class="tooltip-container"></span> | ‘try’ Expr Catches [‘finally’ Expr]
</span><span line-number="15" class=""><span class="tooltip-container"></span> | ‘try’ Expr [‘finally’ Expr]
</span><span line-number="16" class=""><span class="tooltip-container"></span> | ‘throw’ Expr
</span><span line-number="17" class=""><span class="tooltip-container"></span> | ‘return’ [Expr]
</span><span line-number="18" class=""><span class="tooltip-container"></span> | ForExpr
</span><span line-number="19" class=""><span class="tooltip-container"></span> | [SimpleExpr ‘.’] id ‘=’ Expr
</span><span line-number="20" class=""><span class="tooltip-container"></span> | PrefixOperator SimpleExpr ‘=’ Expr
</span><span line-number="21" class=""><span class="tooltip-container"></span> | SimpleExpr ArgumentExprs ‘=’ Expr
</span><span line-number="22" class=""><span class="tooltip-container"></span> | PostfixExpr [Ascription]
</span><span line-number="23" class=""><span class="tooltip-container"></span> | ‘inline’ InfixExpr MatchClause
</span><span line-number="24" class=""><span class="tooltip-container"></span>Ascription ::= ‘:’ InfixType
</span><span line-number="25" class=""><span class="tooltip-container"></span> | ‘:’ Annotation {Annotation}
</span><span line-number="26" class=""><span class="tooltip-container"></span>Catches ::= ‘catch’ (Expr | ExprCaseClause)
</span><span line-number="27" class=""><span class="tooltip-container"></span>PostfixExpr ::= InfixExpr [id] -- only if language.postfixOperators is enabled
</span><span line-number="28" class=""><span class="tooltip-container"></span>InfixExpr ::= PrefixExpr
</span><span line-number="29" class=""><span class="tooltip-container"></span> | InfixExpr id [nl] InfixExpr
</span><span line-number="30" class=""><span class="tooltip-container"></span> | InfixExpr id ColonArgument
</span><span line-number="31" class=""><span class="tooltip-container"></span> | InfixExpr MatchClause
</span><span line-number="32" class=""><span class="tooltip-container"></span>MatchClause ::= ‘match’ <<< CaseClauses >>>
</span><span line-number="33" class=""><span class="tooltip-container"></span>PrefixExpr ::= [PrefixOperator] SimpleExpr
</span><span line-number="34" class=""><span class="tooltip-container"></span>PrefixOperator ::= ‘-’ | ‘+’ | ‘~’ | ‘!’ -- unless backquoted
</span><span line-number="35" class=""><span class="tooltip-container"></span>SimpleExpr ::= SimpleRef
</span><span line-number="36" class=""><span class="tooltip-container"></span> | Literal
</span><span line-number="37" class=""><span class="tooltip-container"></span> | ‘_’
</span><span line-number="38" class=""><span class="tooltip-container"></span> | BlockExpr
</span><span line-number="39" class=""><span class="tooltip-container"></span> | ExprSplice
</span><span line-number="40" class=""><span class="tooltip-container"></span> | Quoted
</span><span line-number="41" class=""><span class="tooltip-container"></span> | quoteId -- only inside splices
</span><span line-number="42" class=""><span class="tooltip-container"></span> | ‘new’ ConstrApp {‘with’ ConstrApp} [TemplateBody]
</span><span line-number="43" class=""><span class="tooltip-container"></span> | ‘new’ TemplateBody
</span><span line-number="44" class=""><span class="tooltip-container"></span> | ‘(’ [ExprsInParens] ‘)’
</span><span line-number="45" class=""><span class="tooltip-container"></span> | SimpleExpr ‘.’ id
</span><span line-number="46" class=""><span class="tooltip-container"></span> | SimpleExpr ‘.’ MatchClause
</span><span line-number="47" class=""><span class="tooltip-container"></span> | SimpleExpr TypeArgs
</span><span line-number="48" class=""><span class="tooltip-container"></span> | SimpleExpr ArgumentExprs
</span><span line-number="49" class=""><span class="tooltip-container"></span> | SimpleExpr ColonArgument
</span><span line-number="50" class=""><span class="tooltip-container"></span>ColonArgument ::= colon [LambdaStart]
</span><span line-number="51" class=""><span class="tooltip-container"></span> indent (CaseClauses | Block) outdent
</span><span line-number="52" class=""><span class="tooltip-container"></span>LambdaStart ::= FunParams (‘=>’ | ‘?=>’)
</span><span line-number="53" class=""><span class="tooltip-container"></span> | HkTypeParamClause ‘=>’
</span><span line-number="54" class=""><span class="tooltip-container"></span>Quoted ::= ‘'’ ‘{’ Block ‘}’
</span><span line-number="55" class=""><span class="tooltip-container"></span> | ‘'’ ‘[’ TypeBlock ‘]’
</span><span line-number="56" class=""><span class="tooltip-container"></span>ExprSplice ::= spliceId -- if inside quoted block
</span><span line-number="57" class=""><span class="tooltip-container"></span> | ‘$’ ‘{’ Block ‘}’ -- unless inside quoted pattern
</span><span line-number="58" class=""><span class="tooltip-container"></span> | ‘$’ ‘{’ Pattern ‘}’ -- when inside quoted pattern
</span><span line-number="59" class=""><span class="tooltip-container"></span>ExprsInParens ::= ExprInParens {‘,’ ExprInParens}
</span><span line-number="60" class=""><span class="tooltip-container"></span>ExprInParens ::= PostfixExpr ‘:’ Type | Expr
</span><span line-number="61" class=""><span class="tooltip-container"></span>ParArgumentExprs ::= ‘(’ [ExprsInParens] ‘)’
</span><span line-number="62" class=""><span class="tooltip-container"></span> | ‘(’ ‘using’ ExprsInParens ‘)’
</span><span line-number="63" class=""><span class="tooltip-container"></span> | ‘(’ [ExprsInParens ‘,’] PostfixExpr ‘*’ ‘)’
</span><span line-number="64" class=""><span class="tooltip-container"></span>ArgumentExprs ::= ParArgumentExprs
</span><span line-number="65" class=""><span class="tooltip-container"></span> | BlockExpr
</span><span line-number="66" class=""><span class="tooltip-container"></span>BlockExpr ::= <<< (CaseClauses | Block) >>>
</span><span line-number="67" class=""><span class="tooltip-container"></span>Block ::= {BlockStat semi} [BlockResult]
</span><span line-number="68" class=""><span class="tooltip-container"></span>BlockStat ::= Import
</span><span line-number="69" class=""><span class="tooltip-container"></span> | {Annotation {nl}} {LocalModifier} Def
</span><span line-number="70" class=""><span class="tooltip-container"></span> | Extension
</span><span line-number="71" class=""><span class="tooltip-container"></span> | Expr1
</span><span line-number="72" class=""><span class="tooltip-container"></span> | EndMarker
</span><span line-number="73" class=""><span class="tooltip-container"></span>TypeBlock ::= {TypeBlockStat semi} Type
</span><span line-number="74" class=""><span class="tooltip-container"></span>TypeBlockStat ::= ‘type’ {nl} TypeDef
</span><span line-number="75" class=""><span class="tooltip-container"></span>
</span><span line-number="76" class=""><span class="tooltip-container"></span>ForExpr ::= ‘for’ ‘(’ Enumerators0 ‘)’ {nl} [‘do‘ | ‘yield’] Expr
</span><span line-number="77" class=""><span class="tooltip-container"></span> | ‘for’ ‘{’ Enumerators0 ‘}’ {nl} [‘do‘ | ‘yield’] Expr
</span><span line-number="78" class=""><span class="tooltip-container"></span> | ‘for’ Enumerators0 (‘do‘ | ‘yield’) Expr
</span><span line-number="79" class=""><span class="tooltip-container"></span>Enumerators0 ::= {nl} Enumerators [semi]
</span><span line-number="80" class=""><span class="tooltip-container"></span>Enumerators ::= Generator {semi Enumerator | Guard}
</span><span line-number="81" class=""><span class="tooltip-container"></span>Enumerator ::= Generator
</span><span line-number="82" class=""><span class="tooltip-container"></span> | Guard {Guard}
</span><span line-number="83" class=""><span class="tooltip-container"></span> | Pattern1 ‘=’ Expr
</span><span line-number="84" class=""><span class="tooltip-container"></span>Generator ::= [‘case’] Pattern1 ‘<-’ Expr
</span><span line-number="85" class=""><span class="tooltip-container"></span>Guard ::= ‘if’ PostfixExpr
</span><span line-number="86" class=""><span class="tooltip-container"></span>
</span><span line-number="87" class=""><span class="tooltip-container"></span>CaseClauses ::= CaseClause { CaseClause }
</span><span line-number="88" class=""><span class="tooltip-container"></span>CaseClause ::= ‘case’ Pattern [Guard] ‘=>’ Block
</span><span line-number="89" class=""><span class="tooltip-container"></span>ExprCaseClause ::= ‘case’ Pattern [Guard] ‘=>’ Expr
</span><span line-number="90" class=""><span class="tooltip-container"></span>TypeCaseClauses ::= TypeCaseClause { TypeCaseClause }
</span><span line-number="91" class=""><span class="tooltip-container"></span>TypeCaseClause ::= ‘case’ (InfixType | ‘_’) ‘=>’ Type [semi]
</span><span line-number="92" class=""><span class="tooltip-container"></span>
</span><span line-number="93" class=""><span class="tooltip-container"></span>Pattern ::= Pattern1 { ‘|’ Pattern1 }
</span><span line-number="94" class=""><span class="tooltip-container"></span>Pattern1 ::= PatVar ‘:’ RefinedType
</span><span line-number="95" class=""><span class="tooltip-container"></span> | [‘-’] integerLiteral ‘:’ RefinedType
</span><span line-number="96" class=""><span class="tooltip-container"></span> | [‘-’] floatingPointLiteral ‘:’ RefinedType
</span><span line-number="97" class=""><span class="tooltip-container"></span> | Pattern2
</span><span line-number="98" class=""><span class="tooltip-container"></span>Pattern2 ::= [id ‘@’] InfixPattern
</span><span line-number="99" class=""><span class="tooltip-container"></span>InfixPattern ::= SimplePattern { id [nl] SimplePattern }
</span><span line-number="100" class=""><span class="tooltip-container"></span>SimplePattern ::= PatVar
</span><span line-number="101" class=""><span class="tooltip-container"></span> | Literal
</span><span line-number="102" class=""><span class="tooltip-container"></span> | ‘(’ [Patterns] ‘)’
</span><span line-number="103" class=""><span class="tooltip-container"></span> | Quoted
</span><span line-number="104" class=""><span class="tooltip-container"></span> | SimplePattern1 [TypeArgs] [ArgumentPatterns]
</span><span line-number="105" class=""><span class="tooltip-container"></span> | ‘given’ RefinedType
</span><span line-number="106" class=""><span class="tooltip-container"></span>SimplePattern1 ::= SimpleRef
</span><span line-number="107" class=""><span class="tooltip-container"></span> | SimplePattern1 ‘.’ id
</span><span line-number="108" class=""><span class="tooltip-container"></span>PatVar ::= varid
</span><span line-number="109" class=""><span class="tooltip-container"></span> | ‘_’
</span><span line-number="110" class=""><span class="tooltip-container"></span>Patterns ::= Pattern {‘,’ Pattern}
</span><span line-number="111" class=""><span class="tooltip-container"></span>
</span><span line-number="112" class=""><span class="tooltip-container"></span>ArgumentPatterns ::= ‘(’ [Patterns] ‘)’
</span><span line-number="113" class=""><span class="tooltip-container"></span> | ‘(’ [Patterns ‘,’] PatVar ‘*’ ‘)’
</span></code></pre>
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</div>
</section>
<section id="type-and-value-parameters-1">
<h3 class="h400"><a href="#type-and-value-parameters-1" class="anchor"></a>Type and Value Parameters</h3>
<div class="snippet mono-small-block">
<pre><code class="language-"><span line-number="1" class=""><span class="tooltip-container"></span>ClsTypeParamClause::= ‘[’ ClsTypeParam {‘,’ ClsTypeParam} ‘]’
</span><span line-number="2" class=""><span class="tooltip-container"></span>ClsTypeParam ::= {Annotation} [‘+’ | ‘-’] id [HkTypeParamClause] TypeParamBounds
</span><span line-number="3" class=""><span class="tooltip-container"></span>
</span><span line-number="4" class=""><span class="tooltip-container"></span>TypTypeParamClause::= ‘[’ TypTypeParam {‘,’ TypTypeParam} ‘]’
</span><span line-number="5" class=""><span class="tooltip-container"></span>TypTypeParam ::= {Annotation} id [HkTypeParamClause] TypeBounds
</span><span line-number="6" class=""><span class="tooltip-container"></span>
</span><span line-number="7" class=""><span class="tooltip-container"></span>HkTypeParamClause ::= ‘[’ HkTypeParam {‘,’ HkTypeParam} ‘]’
</span><span line-number="8" class=""><span class="tooltip-container"></span>HkTypeParam ::= {Annotation} [‘+’ | ‘-’] (id [HkTypeParamClause] | ‘_’) TypeBounds
</span><span line-number="9" class=""><span class="tooltip-container"></span>
</span><span line-number="10" class=""><span class="tooltip-container"></span>ClsParamClauses ::= {ClsParamClause} [[nl] ‘(’ [‘implicit’] ClsParams ‘)’]
</span><span line-number="11" class=""><span class="tooltip-container"></span>ClsParamClause ::= [nl] ‘(’ ClsParams ‘)’
</span><span line-number="12" class=""><span class="tooltip-container"></span> | [nl] ‘(’ ‘using’ (ClsParams | FunArgTypes) ‘)’
</span><span line-number="13" class=""><span class="tooltip-container"></span>ClsParams ::= ClsParam {‘,’ ClsParam}
</span><span line-number="14" class=""><span class="tooltip-container"></span>ClsParam ::= {Annotation} [{Modifier} (‘val’ | ‘var’)] Param
</span><span line-number="15" class=""><span class="tooltip-container"></span>
</span><span line-number="16" class=""><span class="tooltip-container"></span>DefParamClauses ::= DefParamClause { DefParamClause } -- and two DefTypeParamClause cannot be adjacent
</span><span line-number="17" class=""><span class="tooltip-container"></span>DefParamClause ::= DefTypeParamClause
</span><span line-number="18" class=""><span class="tooltip-container"></span> | DefTermParamClause
</span><span line-number="19" class=""><span class="tooltip-container"></span> | UsingParamClause
</span><span line-number="20" class=""><span class="tooltip-container"></span>TypelessClauses ::= TypelessClause {TypelessClause}
</span><span line-number="21" class=""><span class="tooltip-container"></span>TypelessClause ::= DefTermParamClause
</span><span line-number="22" class=""><span class="tooltip-container"></span> | UsingParamClause
</span><span line-number="23" class=""><span class="tooltip-container"></span>
</span><span line-number="24" class=""><span class="tooltip-container"></span>DefTypeParamClause::= [nl] ‘[’ DefTypeParam {‘,’ DefTypeParam} ‘]’
</span><span line-number="25" class=""><span class="tooltip-container"></span>DefTypeParam ::= {Annotation} id [HkTypeParamClause] TypeParamBounds
</span><span line-number="26" class=""><span class="tooltip-container"></span>DefTermParamClause::= [nl] ‘(’ [DefTermParams] ‘)’
</span><span line-number="27" class=""><span class="tooltip-container"></span>UsingParamClause ::= [nl] ‘(’ ‘using’ (DefTermParams | FunArgTypes) ‘)’
</span><span line-number="28" class=""><span class="tooltip-container"></span>DefImplicitClause ::= [nl] ‘(’ ‘implicit’ DefTermParams ‘)’
</span><span line-number="29" class=""><span class="tooltip-container"></span>
</span><span line-number="30" class=""><span class="tooltip-container"></span>DefTermParams ::= DefTermParam {‘,’ DefTermParam}
</span><span line-number="31" class=""><span class="tooltip-container"></span>DefTermParam ::= {Annotation} [‘inline’] Param
</span><span line-number="32" class=""><span class="tooltip-container"></span>Param ::= id ‘:’ ParamType [‘=’ Expr]
</span></code></pre>
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</div>
</section>
<section id="bindings-and-imports-1">
<h3 class="h400"><a href="#bindings-and-imports-1" class="anchor"></a>Bindings and Imports</h3>
<div class="snippet mono-small-block">
<pre><code class="language-"><span line-number="1" class=""><span class="tooltip-container"></span>Bindings ::= ‘(’ [Binding {‘,’ Binding}] ‘)’
</span><span line-number="2" class=""><span class="tooltip-container"></span>Binding ::= (id | ‘_’) [‘:’ Type]
</span><span line-number="3" class=""><span class="tooltip-container"></span>
</span><span line-number="4" class=""><span class="tooltip-container"></span>Modifier ::= LocalModifier
</span><span line-number="5" class=""><span class="tooltip-container"></span> | AccessModifier
</span><span line-number="6" class=""><span class="tooltip-container"></span> | ‘override’
</span><span line-number="7" class=""><span class="tooltip-container"></span> | ‘opaque’
</span><span line-number="8" class=""><span class="tooltip-container"></span>LocalModifier ::= ‘abstract’
</span><span line-number="9" class=""><span class="tooltip-container"></span> | ‘final’
</span><span line-number="10" class=""><span class="tooltip-container"></span> | ‘sealed’
</span><span line-number="11" class=""><span class="tooltip-container"></span> | ‘open’
</span><span line-number="12" class=""><span class="tooltip-container"></span> | ‘implicit’
</span><span line-number="13" class=""><span class="tooltip-container"></span> | ‘lazy’
</span><span line-number="14" class=""><span class="tooltip-container"></span> | ‘inline’
</span><span line-number="15" class=""><span class="tooltip-container"></span> | ‘transparent’
</span><span line-number="16" class=""><span class="tooltip-container"></span> | ‘infix’
</span><span line-number="17" class=""><span class="tooltip-container"></span>AccessModifier ::= (‘private’ | ‘protected’) [AccessQualifier]
</span><span line-number="18" class=""><span class="tooltip-container"></span>AccessQualifier ::= ‘[’ id ‘]’
</span><span line-number="19" class=""><span class="tooltip-container"></span>
</span><span line-number="20" class=""><span class="tooltip-container"></span>Annotation ::= ‘@’ SimpleType {ParArgumentExprs}
</span><span line-number="21" class=""><span class="tooltip-container"></span>
</span><span line-number="22" class=""><span class="tooltip-container"></span>Import ::= ‘import’ ImportExpr {‘,’ ImportExpr}
</span><span line-number="23" class=""><span class="tooltip-container"></span>Export ::= ‘export’ ImportExpr {‘,’ ImportExpr}
</span><span line-number="24" class=""><span class="tooltip-container"></span>ImportExpr ::= SimpleRef {‘.’ id} ‘.’ ImportSpec
</span><span line-number="25" class=""><span class="tooltip-container"></span> | SimpleRef ‘as’ id
</span><span line-number="26" class=""><span class="tooltip-container"></span>ImportSpec ::= NamedSelector
</span><span line-number="27" class=""><span class="tooltip-container"></span> | WildCardSelector
</span><span line-number="28" class=""><span class="tooltip-container"></span> | ‘{’ ImportSelectors) ‘}’
</span><span line-number="29" class=""><span class="tooltip-container"></span>NamedSelector ::= id [‘as’ (id | ‘_’)]
</span><span line-number="30" class=""><span class="tooltip-container"></span>WildCardSelector ::= ‘*’ | ‘given’ [InfixType]
</span><span line-number="31" class=""><span class="tooltip-container"></span>ImportSelectors ::= NamedSelector [‘,’ ImportSelectors]
</span><span line-number="32" class=""><span class="tooltip-container"></span> | WildCardSelector {‘,’ WildCardSelector}
</span><span line-number="33" class=""><span class="tooltip-container"></span>
</span><span line-number="34" class=""><span class="tooltip-container"></span>EndMarker ::= ‘end’ EndMarkerTag -- when followed by EOL
</span><span line-number="35" class=""><span class="tooltip-container"></span>EndMarkerTag ::= id | ‘if’ | ‘while’ | ‘for’ | ‘match’ | ‘try’
</span><span line-number="36" class=""><span class="tooltip-container"></span> | ‘new’ | ‘this’ | ‘given’ | ‘extension’ | ‘val’
</span></code></pre>
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</div>
</section>
<section id="declarations-and-definitions-1">
<h3 class="h400"><a href="#declarations-and-definitions-1" class="anchor"></a>Declarations and Definitions</h3>
<div class="snippet mono-small-block">
<pre><code class="language-"><span line-number="1" class=""><span class="tooltip-container"></span>RefineDcl ::= ‘val’ ValDcl
</span><span line-number="2" class=""><span class="tooltip-container"></span> | ‘def’ DefDcl
</span><span line-number="3" class=""><span class="tooltip-container"></span> | ‘var’ ValDcl
</span><span line-number="4" class=""><span class="tooltip-container"></span> | ‘type’ {nl} TypeDef
</span><span line-number="5" class=""><span class="tooltip-container"></span>ValDcl ::= ids ‘:’ Type
</span><span line-number="6" class=""><span class="tooltip-container"></span>DefDcl ::= DefSig ‘:’ Type
</span><span line-number="7" class=""><span class="tooltip-container"></span>
</span><span line-number="8" class=""><span class="tooltip-container"></span>Def ::= ‘val’ PatDef
</span><span line-number="9" class=""><span class="tooltip-container"></span> | ‘var’ PatDef
</span><span line-number="10" class=""><span class="tooltip-container"></span> | ‘def’ DefDef
</span><span line-number="11" class=""><span class="tooltip-container"></span> | ‘type’ {nl} TypeDef
</span><span line-number="12" class=""><span class="tooltip-container"></span> | TmplDef
</span><span line-number="13" class=""><span class="tooltip-container"></span>PatDef ::= ids [‘:’ Type] [‘=’ Expr]
</span><span line-number="14" class=""><span class="tooltip-container"></span> | Pattern2 [‘:’ Type] [‘=’ Expr] PatDef(_, pats, tpe?, expr)
</span><span line-number="15" class=""><span class="tooltip-container"></span>DefDef ::= DefSig [‘:’ Type] [‘=’ Expr] DefDef(_, name, paramss, tpe, expr)
</span><span line-number="16" class=""><span class="tooltip-container"></span> | ‘this’ TypelessClauses [DefImplicitClause] ‘=’ ConstrExpr DefDef(_, <init>, vparamss, EmptyTree, expr | Block)
</span><span line-number="17" class=""><span class="tooltip-container"></span>DefSig ::= id [DefParamClauses] [DefImplicitClause]
</span><span line-number="18" class=""><span class="tooltip-container"></span>TypeDef ::= id [TypeParamClause] {FunParamClause} TypeBounds TypeDefTree(_, name, tparams, bound
</span><span line-number="19" class=""><span class="tooltip-container"></span> [‘=’ Type]
</span><span line-number="20" class=""><span class="tooltip-container"></span>
</span><span line-number="21" class=""><span class="tooltip-container"></span>TmplDef ::= ([‘case’] ‘class’ | ‘trait’) ClassDef
</span><span line-number="22" class=""><span class="tooltip-container"></span> | [‘case’] ‘object’ ObjectDef
</span><span line-number="23" class=""><span class="tooltip-container"></span> | ‘enum’ EnumDef
</span><span line-number="24" class=""><span class="tooltip-container"></span> | ‘given’ GivenDef
</span><span line-number="25" class=""><span class="tooltip-container"></span>ClassDef ::= id ClassConstr [Template]
</span><span line-number="26" class=""><span class="tooltip-container"></span>ClassConstr ::= [ClsTypeParamClause] [ConstrMods] ClsParamClauses
</span><span line-number="27" class=""><span class="tooltip-container"></span>ConstrMods ::= {Annotation} [AccessModifier]
</span><span line-number="28" class=""><span class="tooltip-container"></span>ObjectDef ::= id [Template]
</span><span line-number="29" class=""><span class="tooltip-container"></span>EnumDef ::= id ClassConstr InheritClauses EnumBody
</span><span line-number="30" class=""><span class="tooltip-container"></span>GivenDef ::= [GivenSig] (AnnotType [‘=’ Expr] | StructuralInstance)
</span><span line-number="31" class=""><span class="tooltip-container"></span>GivenSig ::= [id] [DefTypeParamClause] {UsingParamClause} ‘:’ -- one of `id`, `DefTypeParamClause`, `UsingParamClause` must be present
</span><span line-number="32" class=""><span class="tooltip-container"></span>GivenType ::= AnnotType {id [nl] AnnotType}
</span><span line-number="33" class=""><span class="tooltip-container"></span>StructuralInstance ::= ConstrApp {‘with’ ConstrApp} [‘with’ WithTemplateBody]
</span><span line-number="34" class=""><span class="tooltip-container"></span>Extension ::= ‘extension’ [DefTypeParamClause] {UsingParamClause}
</span><span line-number="35" class=""><span class="tooltip-container"></span> ‘(’ DefTermParam ‘)’ {UsingParamClause} ExtMethods
</span><span line-number="36" class=""><span class="tooltip-container"></span>ExtMethods ::= ExtMethod | [nl] <<< ExtMethod {semi ExtMethod} >>>
</span><span line-number="37" class=""><span class="tooltip-container"></span>ExtMethod ::= {Annotation [nl]} {Modifier} ‘def’ DefDef
</span><span line-number="38" class=""><span class="tooltip-container"></span> | Export
</span><span line-number="39" class=""><span class="tooltip-container"></span>Template ::= InheritClauses [TemplateBody]
</span><span line-number="40" class=""><span class="tooltip-container"></span>InheritClauses ::= [‘extends’ ConstrApps] [‘derives’ QualId {‘,’ QualId}]
</span><span line-number="41" class=""><span class="tooltip-container"></span>ConstrApps ::= ConstrApp ({‘,’ ConstrApp} | {‘with’ ConstrApp})
</span><span line-number="42" class=""><span class="tooltip-container"></span>ConstrApp ::= SimpleType {Annotation} {ParArgumentExprs}
</span><span line-number="43" class=""><span class="tooltip-container"></span>ConstrExpr ::= SelfInvocation
</span><span line-number="44" class=""><span class="tooltip-container"></span> | <<< SelfInvocation {semi BlockStat} >>>
</span><span line-number="45" class=""><span class="tooltip-container"></span>SelfInvocation ::= ‘this’ ArgumentExprs {ArgumentExprs}
</span><span line-number="46" class=""><span class="tooltip-container"></span>
</span><span line-number="47" class=""><span class="tooltip-container"></span>WithTemplateBody ::= <<< [SelfType] TemplateStat {semi TemplateStat} >>>
</span><span line-number="48" class=""><span class="tooltip-container"></span>TemplateBody ::= :<<< [SelfType] TemplateStat {semi TemplateStat} >>>
</span><span line-number="49" class=""><span class="tooltip-container"></span>TemplateStat ::= Import
</span><span line-number="50" class=""><span class="tooltip-container"></span> | Export
</span><span line-number="51" class=""><span class="tooltip-container"></span> | {Annotation [nl]} {Modifier} Def
</span><span line-number="52" class=""><span class="tooltip-container"></span> | Extension
</span><span line-number="53" class=""><span class="tooltip-container"></span> | Expr1
</span><span line-number="54" class=""><span class="tooltip-container"></span> | EndMarker
</span><span line-number="55" class=""><span class="tooltip-container"></span> |
</span><span line-number="56" class=""><span class="tooltip-container"></span>SelfType ::= id [‘:’ InfixType] ‘=>’
</span><span line-number="57" class=""><span class="tooltip-container"></span> | ‘this’ ‘:’ InfixType ‘=>’
</span><span line-number="58" class=""><span class="tooltip-container"></span>
</span><span line-number="59" class=""><span class="tooltip-container"></span>EnumBody ::= :<<< [SelfType] EnumStat {semi EnumStat} >>>
</span><span line-number="60" class=""><span class="tooltip-container"></span>EnumStat ::= TemplateStat
</span><span line-number="61" class=""><span class="tooltip-container"></span> | {Annotation [nl]} {Modifier} EnumCase
</span><span line-number="62" class=""><span class="tooltip-container"></span>EnumCase ::= ‘case’ (id ClassConstr [‘extends’ ConstrApps]] | ids)
</span><span line-number="63" class=""><span class="tooltip-container"></span>
</span><span line-number="64" class=""><span class="tooltip-container"></span>TopStats ::= TopStat {semi TopStat}
</span><span line-number="65" class=""><span class="tooltip-container"></span>TopStat ::= Import
</span><span line-number="66" class=""><span class="tooltip-container"></span> | Export
</span><span line-number="67" class=""><span class="tooltip-container"></span> | {Annotation [nl]} {Modifier} Def
</span><span line-number="68" class=""><span class="tooltip-container"></span> | Extension
</span><span line-number="69" class=""><span class="tooltip-container"></span> | Packaging
</span><span line-number="70" class=""><span class="tooltip-container"></span> | PackageObject
</span><span line-number="71" class=""><span class="tooltip-container"></span> | EndMarker
</span><span line-number="72" class=""><span class="tooltip-container"></span> |
</span><span line-number="73" class=""><span class="tooltip-container"></span>Packaging ::= ‘package’ QualId :<<< TopStats >>>
</span><span line-number="74" class=""><span class="tooltip-container"></span>PackageObject ::= ‘package’ ‘object’ ObjectDef
</span><span line-number="75" class=""><span class="tooltip-container"></span>
</span><span line-number="76" class=""><span class="tooltip-container"></span>CompilationUnit ::= {‘package’ QualId semi} TopStats
</span></code></pre>
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