Add regression test for igordejanovic#16, subtract overflow

tests/build.rs

@@ -200,6 +200,10 @@ fn main() {
             "glr/special/farshi_g8",
             Box::new(|s| s.parser_algo(ParserAlgo::GLR)),
         ),
+        (
+            "glr/regressions/issue_16_subtract_overflow_panic",
+            Box::new(|s| s.parser_algo(ParserAlgo::GLR)),
+        ),
     ];
 
     for (test, config) in tests {

tests/src/glr/mod.rs

@@ -3,4 +3,5 @@ mod errors;
 mod evaluate;
 mod forest;
 mod lexical_ambiguity;
+mod regressions;
 mod special;

tests/src/glr/regressions/issue_16_subtract_overflow_panic/inline.rustemo

@@ -0,0 +1,43 @@
+Inline: InlineEl*;
+InlineEl: prefix=StrongDelim children=Inline suffix=StrongDelim? {Strong, 11, left}
+        | prefix=EmphasisDelim children=Inline suffix=EmphasisDelim? {Emphasis, 11, left} 
+        | title_prefix=LinkTitlePrefix title=Inline continuation=Link1? {Link , 11, left}
+        | prefix=CodeDelim text=CodeChar* suffix=CodeDelim? {Code, 11, left} 
+        | text=TextChar+ {Text, 9, left};
+
+StrongDelim: StrongT;
+
+EmphasisDelim: EmphasisT;
+
+LinkTitlePrefix: LinkTitlePrefixT;
+LinkTitleSuffix: LinkTitleSuffixT;
+LinkAddressPrefix: LinkAddressPrefixT;
+LinkAddressSuffix: LinkAddressSuffixT;
+Link1: title_suffix=LinkTitleSuffix address=LinkAddress?;
+LinkAddress: prefix=LinkAddressPrefix address=LinkAddressChar* suffix=LinkAddressSuffix?;
+LinkAddressChar: LinkAddressCharT | EscapedChar;
+
+CodeDelim: CodeDelimT;
+CodeChar: CodeCharT | EscapedChar;
+
+TextChar: TextCharT | EscapedChar;
+
+EscapeChar: EscapeT;
+EscapedChar: prefix=EscapeChar text=AnyCharT;
+
+Layout: Empty;
+
+terminals
+Empty: "";
+EscapeT: "\\";
+AnyCharT: /./;
+TextCharT: /[^*_`\\]/;
+CodeDelimT: "`";
+CodeCharT: /[^`\\]/;
+LinkTitlePrefixT: "[";
+LinkTitleSuffixT: "](";
+LinkAddressPrefixT: "(";
+LinkAddressSuffixT: ")";
+LinkAddressCharT: /[^)\\]/;
+StrongT: "*";
+EmphasisT: "_";

tests/src/glr/regressions/issue_16_subtract_overflow_panic/mod.rs

@@ -0,0 +1,22 @@
+use rustemo::{rustemo_mod, Parser};
+
+rustemo_mod!(
+    inline,
+    "/src/glr/regressions/issue_16_subtract_overflow_panic"
+);
+rustemo_mod!(
+    inline_actions,
+    "/src/glr/regressions/issue_16_subtract_overflow_panic"
+);
+
+use self::inline::{DefaultBuilder, InlineParser};
+
+#[test]
+fn subtract_overflow() {
+    InlineParser::new()
+        .parse("*ld 2")
+        .unwrap()
+        .get_first_tree()
+        .unwrap()
+        .build(&mut DefaultBuilder::new());
+}

tests/src/glr/regressions/mod.rs

@@ -0,0 +1 @@
+mod issue_16_subtract_overflow_panic;