diff --git a/compiler/rustc_const_eval/src/transform/validate.rs b/compiler/rustc_const_eval/src/transform/validate.rs index 76b316cdf0c3f..56c60d59d2858 100644 --- a/compiler/rustc_const_eval/src/transform/validate.rs +++ b/compiler/rustc_const_eval/src/transform/validate.rs @@ -13,7 +13,7 @@ use rustc_middle::mir::{ RetagKind, RuntimePhase, Rvalue, SourceScope, Statement, StatementKind, Terminator, TerminatorKind, UnOp, START_BLOCK, }; -use rustc_middle::ty::{self, InstanceDef, ParamEnv, Ty, TyCtxt}; +use rustc_middle::ty::{self, InstanceDef, ParamEnv, Ty, TyCtxt, TypeVisitable}; use rustc_mir_dataflow::impls::MaybeStorageLive; use rustc_mir_dataflow::storage::always_storage_live_locals; use rustc_mir_dataflow::{Analysis, ResultsCursor}; @@ -231,6 +231,15 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> { return true; } + // We sometimes have to use `defining_opaque_types` for subtyping + // to succeed here and figuring out how exactly that should work + // is annoying. It is harmless enough to just not validate anything + // in that case. We still check this after analysis as all opque + // types have been revealed at this point. + if (src, dest).has_opaque_types() { + return true; + } + crate::util::is_subtype(self.tcx, self.param_env, src, dest) } } diff --git a/compiler/rustc_hir_typeck/src/_match.rs b/compiler/rustc_hir_typeck/src/_match.rs index 88fb265358686..e19ef2ff3bf48 100644 --- a/compiler/rustc_hir_typeck/src/_match.rs +++ b/compiler/rustc_hir_typeck/src/_match.rs @@ -41,7 +41,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { // #55810: Type check patterns first so we get types for all bindings. let scrut_span = scrut.span.find_ancestor_inside(expr.span).unwrap_or(scrut.span); for arm in arms { - self.check_pat_top(&arm.pat, scrutinee_ty, Some(scrut_span), true); + self.check_pat_top(&arm.pat, scrutinee_ty, Some(scrut_span), Some(scrut)); } // Now typecheck the blocks. diff --git a/compiler/rustc_hir_typeck/src/check.rs b/compiler/rustc_hir_typeck/src/check.rs index 1c70c1b71e763..cc515e6c85313 100644 --- a/compiler/rustc_hir_typeck/src/check.rs +++ b/compiler/rustc_hir_typeck/src/check.rs @@ -90,7 +90,7 @@ pub(super) fn check_fn<'a, 'tcx>( for (idx, (param_ty, param)) in inputs_fn.chain(maybe_va_list).zip(body.params).enumerate() { // Check the pattern. let ty_span = try { inputs_hir?.get(idx)?.span }; - fcx.check_pat_top(¶m.pat, param_ty, ty_span, false); + fcx.check_pat_top(¶m.pat, param_ty, ty_span, None); // Check that argument is Sized. // The check for a non-trivial pattern is a hack to avoid duplicate warnings diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs index 2a1265600de8b..9c7a84ce198e8 100644 --- a/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs +++ b/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs @@ -1330,11 +1330,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { // Does the expected pattern type originate from an expression and what is the span? let (origin_expr, ty_span) = match (decl.ty, decl.init) { - (Some(ty), _) => (false, Some(ty.span)), // Bias towards the explicit user type. + (Some(ty), _) => (None, Some(ty.span)), // Bias towards the explicit user type. (_, Some(init)) => { - (true, Some(init.span.find_ancestor_inside(decl.span).unwrap_or(init.span))) + (Some(init), Some(init.span.find_ancestor_inside(decl.span).unwrap_or(init.span))) } // No explicit type; so use the scrutinee. - _ => (false, None), // We have `let $pat;`, so the expected type is unconstrained. + _ => (None, None), // We have `let $pat;`, so the expected type is unconstrained. }; // Type check the pattern. Override if necessary to avoid knock-on errors. diff --git a/compiler/rustc_hir_typeck/src/pat.rs b/compiler/rustc_hir_typeck/src/pat.rs index 46799245222dc..52236ae56eeaa 100644 --- a/compiler/rustc_hir_typeck/src/pat.rs +++ b/compiler/rustc_hir_typeck/src/pat.rs @@ -46,7 +46,7 @@ struct TopInfo<'tcx> { /// Was the origin of the `span` from a scrutinee expression? /// /// Otherwise there is no scrutinee and it could be e.g. from the type of a formal parameter. - origin_expr: bool, + origin_expr: Option<&'tcx hir::Expr<'tcx>>, /// The span giving rise to the `expected` type, if one could be provided. /// /// If `origin_expr` is `true`, then this is the span of the scrutinee as in: @@ -74,7 +74,8 @@ struct TopInfo<'tcx> { impl<'tcx> FnCtxt<'_, 'tcx> { fn pattern_cause(&self, ti: TopInfo<'tcx>, cause_span: Span) -> ObligationCause<'tcx> { - let code = Pattern { span: ti.span, root_ty: ti.expected, origin_expr: ti.origin_expr }; + let code = + Pattern { span: ti.span, root_ty: ti.expected, origin_expr: ti.origin_expr.is_some() }; self.cause(cause_span, code) } @@ -85,7 +86,14 @@ impl<'tcx> FnCtxt<'_, 'tcx> { actual: Ty<'tcx>, ti: TopInfo<'tcx>, ) -> Option> { - self.demand_eqtype_with_origin(&self.pattern_cause(ti, cause_span), expected, actual) + let mut diag = + self.demand_eqtype_with_origin(&self.pattern_cause(ti, cause_span), expected, actual)?; + if let Some(expr) = ti.origin_expr { + self.suggest_fn_call(&mut diag, expr, expected, |output| { + self.can_eq(self.param_env, output, actual).is_ok() + }); + } + Some(diag) } fn demand_eqtype_pat( @@ -127,7 +135,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { pat: &'tcx Pat<'tcx>, expected: Ty<'tcx>, span: Option, - origin_expr: bool, + origin_expr: Option<&'tcx hir::Expr<'tcx>>, ) { let info = TopInfo { expected, origin_expr, span }; self.check_pat(pat, expected, INITIAL_BM, info); @@ -2146,7 +2154,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { err.help("the semantics of slice patterns changed recently; see issue #62254"); } else if self.autoderef(span, expected_ty) .any(|(ty, _)| matches!(ty.kind(), ty::Slice(..) | ty::Array(..))) - && let (Some(span), true) = (ti.span, ti.origin_expr) + && let Some(span) = ti.span + && let Some(_) = ti.origin_expr && let Ok(snippet) = self.tcx.sess.source_map().span_to_snippet(span) { let ty = self.resolve_vars_if_possible(ti.expected); diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs index 2b543520198fb..048a547199419 100644 --- a/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs +++ b/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs @@ -19,6 +19,7 @@ use rustc_hir as hir; use rustc_hir::def::DefKind; use rustc_hir::def_id::DefId; use rustc_hir::intravisit::Visitor; +use rustc_hir::is_range_literal; use rustc_hir::lang_items::LangItem; use rustc_hir::{AsyncGeneratorKind, GeneratorKind, Node}; use rustc_hir::{Expr, HirId}; @@ -1349,14 +1350,41 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { Applicability::MaybeIncorrect, ); } else { + // Issue #104961, we need to add parentheses properly for compond expressions + // for example, `x.starts_with("hi".to_string() + "you")` + // should be `x.starts_with(&("hi".to_string() + "you"))` + let Some(body_id) = self.tcx.hir().maybe_body_owned_by(obligation.cause.body_id) else { return false; }; + let body = self.tcx.hir().body(body_id); + let mut expr_finder = FindExprBySpan::new(span); + expr_finder.visit_expr(body.value); + let Some(expr) = expr_finder.result else { return false; }; + let needs_parens = match expr.kind { + // parenthesize if needed (Issue #46756) + hir::ExprKind::Cast(_, _) | hir::ExprKind::Binary(_, _, _) => true, + // parenthesize borrows of range literals (Issue #54505) + _ if is_range_literal(expr) => true, + _ => false, + }; + let is_mut = mut_ref_self_ty_satisfies_pred || ref_inner_ty_mut; - err.span_suggestion_verbose( - span.shrink_to_lo(), - &format!( - "consider{} borrowing here", - if is_mut { " mutably" } else { "" } - ), - format!("&{}", if is_mut { "mut " } else { "" }), + let span = if needs_parens { span } else { span.shrink_to_lo() }; + let sugg_prefix = format!("&{}", if is_mut { "mut " } else { "" }); + let sugg_msg = &format!( + "consider{} borrowing here", + if is_mut { " mutably" } else { "" } + ); + + let suggestions = if !needs_parens { + vec![(span.shrink_to_lo(), format!("{}", sugg_prefix))] + } else { + vec![ + (span.shrink_to_lo(), format!("{}(", sugg_prefix)), + (span.shrink_to_hi(), ")".to_string()), + ] + }; + err.multipart_suggestion_verbose( + sugg_msg, + suggestions, Applicability::MaybeIncorrect, ); } diff --git a/library/core/src/alloc/global.rs b/library/core/src/alloc/global.rs index 1d80b8bf9ec76..18da70451f299 100644 --- a/library/core/src/alloc/global.rs +++ b/library/core/src/alloc/global.rs @@ -203,7 +203,7 @@ pub unsafe trait GlobalAlloc { ptr } - /// Shrink or grow a block of memory to the given `new_size`. + /// Shrink or grow a block of memory to the given `new_size` in bytes. /// The block is described by the given `ptr` pointer and `layout`. /// /// If this returns a non-null pointer, then ownership of the memory block @@ -211,10 +211,11 @@ pub unsafe trait GlobalAlloc { /// Any access to the old `ptr` is Undefined Behavior, even if the /// allocation remained in-place. The newly returned pointer is the only valid pointer /// for accessing this memory now. + /// /// The new memory block is allocated with `layout`, - /// but with the `size` updated to `new_size`. This new layout must be - /// used when deallocating the new memory block with `dealloc`. The range - /// `0..min(layout.size(), new_size)` of the new memory block is + /// but with the `size` updated to `new_size` in bytes. + /// This new layout must be used when deallocating the new memory block with `dealloc`. + /// The range `0..min(layout.size(), new_size)` of the new memory block is /// guaranteed to have the same values as the original block. /// /// If this method returns null, then ownership of the memory diff --git a/library/std/src/sys/unix/args.rs b/library/std/src/sys/unix/args.rs index a342f0f5e8597..a5ce6d5120dad 100644 --- a/library/std/src/sys/unix/args.rs +++ b/library/std/src/sys/unix/args.rs @@ -141,12 +141,28 @@ mod imp { // list. let argv = ARGV.load(Ordering::Relaxed); let argc = if argv.is_null() { 0 } else { ARGC.load(Ordering::Relaxed) }; - (0..argc) - .map(|i| { - let cstr = CStr::from_ptr(*argv.offset(i) as *const libc::c_char); - OsStringExt::from_vec(cstr.to_bytes().to_vec()) - }) - .collect() + let mut args = Vec::with_capacity(argc as usize); + for i in 0..argc { + let ptr = *argv.offset(i) as *const libc::c_char; + + // Some C commandline parsers (e.g. GLib and Qt) are replacing already + // handled arguments in `argv` with `NULL` and move them to the end. That + // means that `argc` might be bigger than the actual number of non-`NULL` + // pointers in `argv` at this point. + // + // To handle this we simply stop iterating at the first `NULL` argument. + // + // `argv` is also guaranteed to be `NULL`-terminated so any non-`NULL` arguments + // after the first `NULL` can safely be ignored. + if ptr.is_null() { + break; + } + + let cstr = CStr::from_ptr(ptr); + args.push(OsStringExt::from_vec(cstr.to_bytes().to_vec())); + } + + args } } } diff --git a/library/std/src/sys/windows/fs.rs b/library/std/src/sys/windows/fs.rs index 3780980382879..f1a784b5fd2e7 100644 --- a/library/std/src/sys/windows/fs.rs +++ b/library/std/src/sys/windows/fs.rs @@ -1393,6 +1393,8 @@ fn symlink_junction_inner(original: &Path, junction: &Path) -> io::Result<()> { let mut data = Align8([MaybeUninit::::uninit(); c::MAXIMUM_REPARSE_DATA_BUFFER_SIZE]); let data_ptr = data.0.as_mut_ptr(); let db = data_ptr.cast::(); + // Zero the header to ensure it's fully initialized, including reserved parameters. + *db = mem::zeroed(); let buf = ptr::addr_of_mut!((*db).ReparseTarget).cast::(); let mut i = 0; // FIXME: this conversion is very hacky diff --git a/src/librustdoc/html/render/context.rs b/src/librustdoc/html/render/context.rs index b59645ec2e2d5..1216a8d71c8cf 100644 --- a/src/librustdoc/html/render/context.rs +++ b/src/librustdoc/html/render/context.rs @@ -18,7 +18,7 @@ use super::search_index::build_index; use super::write_shared::write_shared; use super::{ collect_spans_and_sources, print_sidebar, scrape_examples_help, sidebar_module_like, AllTypes, - LinkFromSrc, NameDoc, StylePath, + LinkFromSrc, StylePath, }; use crate::clean::{self, types::ExternalLocation, ExternalCrate}; @@ -256,7 +256,7 @@ impl<'tcx> Context<'tcx> { } /// Construct a map of items shown in the sidebar to a plain-text summary of their docs. - fn build_sidebar_items(&self, m: &clean::Module) -> BTreeMap> { + fn build_sidebar_items(&self, m: &clean::Module) -> BTreeMap> { // BTreeMap instead of HashMap to get a sorted output let mut map: BTreeMap<_, Vec<_>> = BTreeMap::new(); let mut inserted: FxHashMap> = FxHashMap::default(); @@ -274,10 +274,7 @@ impl<'tcx> Context<'tcx> { if inserted.entry(short).or_default().insert(myname) { let short = short.to_string(); let myname = myname.to_string(); - map.entry(short).or_default().push(( - myname, - Some(item.doc_value().map_or_else(String::new, |s| plain_text_summary(&s))), - )); + map.entry(short).or_default().push(myname); } } diff --git a/src/librustdoc/html/render/mod.rs b/src/librustdoc/html/render/mod.rs index fa22c46120517..6a9a7a6b1a088 100644 --- a/src/librustdoc/html/render/mod.rs +++ b/src/librustdoc/html/render/mod.rs @@ -83,9 +83,6 @@ use crate::scrape_examples::{CallData, CallLocation}; use crate::try_none; use crate::DOC_RUST_LANG_ORG_CHANNEL; -/// A pair of name and its optional document. -pub(crate) type NameDoc = (String, Option); - pub(crate) fn ensure_trailing_slash(v: &str) -> impl fmt::Display + '_ { crate::html::format::display_fn(move |f| { if !v.ends_with('/') && !v.is_empty() { write!(f, "{}/", v) } else { f.write_str(v) } diff --git a/src/librustdoc/html/static/js/main.js b/src/librustdoc/html/static/js/main.js index c66f500f42333..aa4d65b4bfbcd 100644 --- a/src/librustdoc/html/static/js/main.js +++ b/src/librustdoc/html/static/js/main.js @@ -455,10 +455,7 @@ function loadCss(cssUrl) { const ul = document.createElement("ul"); ul.className = "block " + shortty; - for (const item of filtered) { - const name = item[0]; - const desc = item[1]; // can be null - + for (const name of filtered) { let path; if (shortty === "mod") { path = name + "/index.html"; @@ -468,7 +465,6 @@ function loadCss(cssUrl) { const current_page = document.location.href.split("/").pop(); const link = document.createElement("a"); link.href = path; - link.title = desc; if (path === current_page) { link.className = "current"; } diff --git a/tests/rustdoc/markdown-summaries.rs b/tests/rustdoc/markdown-summaries.rs deleted file mode 100644 index 31e7072b5ce9b..0000000000000 --- a/tests/rustdoc/markdown-summaries.rs +++ /dev/null @@ -1,27 +0,0 @@ -#![crate_type = "lib"] -#![crate_name = "summaries"] - -//! This *summary* has a [link] and `code`. -//! -//! This is the second paragraph. -//! -//! [link]: https://example.com - -// @hasraw search-index.js 'This summary has a link and code.' -// @!hasraw - 'second paragraph' - -/// This `code` will be rendered in a code tag. -/// -/// This text should not be rendered. -pub struct Sidebar; - -// @hasraw search-index.js 'This code will be rendered in a code tag.' -// @hasraw summaries/sidebar-items.js 'This `code` will be rendered in a code tag.' -// @!hasraw - 'text should not be rendered' - -/// ```text -/// this block should not be rendered -/// ``` -pub struct Sidebar2; - -// @!hasraw summaries/sidebar-items.js 'block should not be rendered' diff --git a/tests/ui/const-generics/wrong-normalization.rs b/tests/ui/const-generics/wrong-normalization.rs new file mode 100644 index 0000000000000..f1ce317b3f78b --- /dev/null +++ b/tests/ui/const-generics/wrong-normalization.rs @@ -0,0 +1,19 @@ +// This test ensures that if implementation on projections is supported, +// it doesn't end in very weird cycle error. + +#![crate_type = "lib"] + +pub trait Identity { + type Identity: ?Sized; +} + +impl Identity for T { + type Identity = Self; +} + +pub struct I8; + +impl as Identity>::Identity { +//~^ ERROR no nominal type found for inherent implementation + pub fn foo(&self) {} +} diff --git a/tests/ui/const-generics/wrong-normalization.stderr b/tests/ui/const-generics/wrong-normalization.stderr new file mode 100644 index 0000000000000..fb806bdb1e747 --- /dev/null +++ b/tests/ui/const-generics/wrong-normalization.stderr @@ -0,0 +1,11 @@ +error[E0118]: no nominal type found for inherent implementation + --> $DIR/wrong-normalization.rs:16:6 + | +LL | impl as Identity>::Identity { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl requires a nominal type + | + = note: either implement a trait on it or create a newtype to wrap it instead + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0118`. diff --git a/tests/ui/impl-trait/nested-return-type2.rs b/tests/ui/impl-trait/nested-return-type2.rs index cc1f1f4ec44c8..fe883ce6fc8ed 100644 --- a/tests/ui/impl-trait/nested-return-type2.rs +++ b/tests/ui/impl-trait/nested-return-type2.rs @@ -1,4 +1,7 @@ // check-pass +// compile-flags: -Zvalidate-mir + +// Using -Zvalidate-mir as a regression test for #107346. trait Duh {} diff --git a/tests/ui/impl-trait/nested-return-type2.stderr b/tests/ui/impl-trait/nested-return-type2.stderr index 3aed05ca13298..09ad3bd05c1b3 100644 --- a/tests/ui/impl-trait/nested-return-type2.stderr +++ b/tests/ui/impl-trait/nested-return-type2.stderr @@ -1,5 +1,5 @@ warning: opaque type `impl Trait` does not satisfy its associated type bounds - --> $DIR/nested-return-type2.rs:25:24 + --> $DIR/nested-return-type2.rs:28:24 | LL | type Assoc: Duh; | --- this associated type bound is unsatisfied for `impl Send` diff --git a/tests/ui/suggestions/issue-104961.fixed b/tests/ui/suggestions/issue-104961.fixed new file mode 100644 index 0000000000000..520d638b1748f --- /dev/null +++ b/tests/ui/suggestions/issue-104961.fixed @@ -0,0 +1,16 @@ +// run-rustfix + +fn foo(x: &str) -> bool { + x.starts_with(&("hi".to_string() + " you")) + //~^ ERROR expected a `FnMut<(char,)>` closure, found `String` +} + +fn foo2(x: &str) -> bool { + x.starts_with(&"hi".to_string()) + //~^ ERROR expected a `FnMut<(char,)>` closure, found `String` +} + +fn main() { + foo("hi you"); + foo2("hi"); +} diff --git a/tests/ui/suggestions/issue-104961.rs b/tests/ui/suggestions/issue-104961.rs new file mode 100644 index 0000000000000..aeb787abb6fc8 --- /dev/null +++ b/tests/ui/suggestions/issue-104961.rs @@ -0,0 +1,16 @@ +// run-rustfix + +fn foo(x: &str) -> bool { + x.starts_with("hi".to_string() + " you") + //~^ ERROR expected a `FnMut<(char,)>` closure, found `String` +} + +fn foo2(x: &str) -> bool { + x.starts_with("hi".to_string()) + //~^ ERROR expected a `FnMut<(char,)>` closure, found `String` +} + +fn main() { + foo("hi you"); + foo2("hi"); +} diff --git a/tests/ui/suggestions/issue-104961.stderr b/tests/ui/suggestions/issue-104961.stderr new file mode 100644 index 0000000000000..8cec6a3f8270a --- /dev/null +++ b/tests/ui/suggestions/issue-104961.stderr @@ -0,0 +1,37 @@ +error[E0277]: expected a `FnMut<(char,)>` closure, found `String` + --> $DIR/issue-104961.rs:4:19 + | +LL | x.starts_with("hi".to_string() + " you") + | ----------- ^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Pattern<'_>` is not implemented for `String` + | | + | required by a bound introduced by this call + | + = note: the trait bound `String: Pattern<'_>` is not satisfied + = note: required for `String` to implement `Pattern<'_>` +note: required by a bound in `core::str::::starts_with` + --> $SRC_DIR/core/src/str/mod.rs:LL:COL +help: consider borrowing here + | +LL | x.starts_with(&("hi".to_string() + " you")) + | ++ + + +error[E0277]: expected a `FnMut<(char,)>` closure, found `String` + --> $DIR/issue-104961.rs:9:19 + | +LL | x.starts_with("hi".to_string()) + | ----------- ^^^^^^^^^^^^^^^^ the trait `Pattern<'_>` is not implemented for `String` + | | + | required by a bound introduced by this call + | + = note: the trait bound `String: Pattern<'_>` is not satisfied + = note: required for `String` to implement `Pattern<'_>` +note: required by a bound in `core::str::::starts_with` + --> $SRC_DIR/core/src/str/mod.rs:LL:COL +help: consider borrowing here + | +LL | x.starts_with(&"hi".to_string()) + | + + +error: aborting due to 2 previous errors + +For more information about this error, try `rustc --explain E0277`. diff --git a/tests/ui/suggestions/suggest-call-on-pat-mismatch.rs b/tests/ui/suggestions/suggest-call-on-pat-mismatch.rs new file mode 100644 index 0000000000000..657dd9c22c21b --- /dev/null +++ b/tests/ui/suggestions/suggest-call-on-pat-mismatch.rs @@ -0,0 +1,16 @@ +enum E { + One(i32, i32), +} + +fn main() { + let var = E::One; + if let E::One(var1, var2) = var { + //~^ ERROR mismatched types + //~| HELP use parentheses to construct this tuple variant + println!("{var1} {var2}"); + } + + let Some(x) = Some; + //~^ ERROR mismatched types + //~| HELP use parentheses to construct this tuple variant +} diff --git a/tests/ui/suggestions/suggest-call-on-pat-mismatch.stderr b/tests/ui/suggestions/suggest-call-on-pat-mismatch.stderr new file mode 100644 index 0000000000000..7338312bab651 --- /dev/null +++ b/tests/ui/suggestions/suggest-call-on-pat-mismatch.stderr @@ -0,0 +1,33 @@ +error[E0308]: mismatched types + --> $DIR/suggest-call-on-pat-mismatch.rs:7:12 + | +LL | if let E::One(var1, var2) = var { + | ^^^^^^^^^^^^^^^^^^ --- this expression has type `fn(i32, i32) -> E {E::One}` + | | + | expected enum constructor, found `E` + | + = note: expected enum constructor `fn(i32, i32) -> E {E::One}` + found enum `E` +help: use parentheses to construct this tuple variant + | +LL | if let E::One(var1, var2) = var(/* i32 */, /* i32 */) { + | ++++++++++++++++++++++ + +error[E0308]: mismatched types + --> $DIR/suggest-call-on-pat-mismatch.rs:13:9 + | +LL | let Some(x) = Some; + | ^^^^^^^ ---- this expression has type `fn(_) -> Option<_> {Option::<_>::Some}` + | | + | expected enum constructor, found `Option<_>` + | + = note: expected enum constructor `fn(_) -> Option<_> {Option::<_>::Some}` + found enum `Option<_>` +help: use parentheses to construct this tuple variant + | +LL | let Some(x) = Some(/* value */); + | +++++++++++++ + +error: aborting due to 2 previous errors + +For more information about this error, try `rustc --explain E0308`. diff --git a/tests/ui/traits/new-solver/param-candidate-doesnt-shadow-project.rs b/tests/ui/traits/new-solver/param-candidate-doesnt-shadow-project.rs new file mode 100644 index 0000000000000..bdf999ec5dd00 --- /dev/null +++ b/tests/ui/traits/new-solver/param-candidate-doesnt-shadow-project.rs @@ -0,0 +1,25 @@ +// compile-flags: -Ztrait-solver=next +// check-pass + +trait Foo { + type Assoc; +} + +trait Bar {} + +impl Foo for T { + type Assoc = i32; +} + +impl Bar for T where T: Foo {} + +fn require_bar() {} + +fn foo() { + // Unlike the classic solver, `::Assoc = _` will still project + // down to `i32` even though there's a param-env candidate here, since we + // don't assemble any param-env projection candidates for `T: Foo` alone. + require_bar::(); +} + +fn main() {} diff --git a/tests/ui/traits/new-solver/two-projection-param-candidates-are-ambiguous.rs b/tests/ui/traits/new-solver/two-projection-param-candidates-are-ambiguous.rs new file mode 100644 index 0000000000000..cde2059ca9b91 --- /dev/null +++ b/tests/ui/traits/new-solver/two-projection-param-candidates-are-ambiguous.rs @@ -0,0 +1,30 @@ +// compile-flags: -Ztrait-solver=next + +// When we're solving `::Assoc = i32`, we actually first solve +// `::Assoc = _#1t`, then unify `_#1t` with `i32`. That goal +// with the inference variable is ambiguous when there are >1 param-env +// candidates. + +// We don't unify the RHS of a projection goal eagerly when solving, both +// for caching reasons and partly to make sure that we don't make the new +// trait solver smarter than it should be. + +// This is (as far as I can tell) a forwards-compatible decision, but if you +// make this test go from fail to pass, be sure you understand the implications! + +trait Foo { + type Assoc; +} + +trait Bar {} + +impl Bar for T where T: Foo {} + +fn needs_bar() {} + +fn foo + Foo>() { + needs_bar::(); + //~^ ERROR type annotations needed: cannot satisfy `T: Bar` +} + +fn main() {} diff --git a/tests/ui/traits/new-solver/two-projection-param-candidates-are-ambiguous.stderr b/tests/ui/traits/new-solver/two-projection-param-candidates-are-ambiguous.stderr new file mode 100644 index 0000000000000..fa5e780ee5e8b --- /dev/null +++ b/tests/ui/traits/new-solver/two-projection-param-candidates-are-ambiguous.stderr @@ -0,0 +1,16 @@ +error[E0283]: type annotations needed: cannot satisfy `T: Bar` + --> $DIR/two-projection-param-candidates-are-ambiguous.rs:26:5 + | +LL | needs_bar::(); + | ^^^^^^^^^^^^^^ + | + = note: cannot satisfy `T: Bar` +note: required by a bound in `needs_bar` + --> $DIR/two-projection-param-candidates-are-ambiguous.rs:23:17 + | +LL | fn needs_bar() {} + | ^^^ required by this bound in `needs_bar` + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0283`.