From 38af9fef52e716ca38cf182a9d86ff49953a586f Mon Sep 17 00:00:00 2001 From: Philip Herron Date: Sun, 4 Feb 2024 17:07:05 +0000 Subject: [PATCH] gccrs: fix bug in pattern check for tuples We can point to generic parent types which means we need to do the shallow resolve thing that rustc does. We have destructure which is similar to get what the parameter type points to. Fixes #2775 gcc/rust/ChangeLog: * typecheck/rust-hir-type-check-pattern.cc (TypeCheckPattern::visit): use destructure gcc/testsuite/ChangeLog: * rust/compile/issue-2775.rs: New test. Signed-off-by: Philip Herron --- gcc/rust/typecheck/rust-hir-type-check-pattern.cc | 6 ++++-- gcc/testsuite/rust/compile/issue-2775.rs | 11 +++++++++++ 2 files changed, 15 insertions(+), 2 deletions(-) create mode 100644 gcc/testsuite/rust/compile/issue-2775.rs diff --git a/gcc/rust/typecheck/rust-hir-type-check-pattern.cc b/gcc/rust/typecheck/rust-hir-type-check-pattern.cc index 7ad0147327cb..9d74def0b5c6 100644 --- a/gcc/rust/typecheck/rust-hir-type-check-pattern.cc +++ b/gcc/rust/typecheck/rust-hir-type-check-pattern.cc @@ -302,7 +302,8 @@ TypeCheckPattern::visit (HIR::TuplePattern &pattern) = *static_cast ( pattern.get_items ().get ()); - if (parent->get_kind () != TyTy::TUPLE) + auto resolved_parent = parent->destructure (); + if (resolved_parent->get_kind () != TyTy::TUPLE) { rust_error_at (pattern.get_locus (), "expected %s, found tuple", parent->as_string ().c_str ()); @@ -312,7 +313,8 @@ TypeCheckPattern::visit (HIR::TuplePattern &pattern) const auto &patterns = ref.get_patterns (); size_t nitems_to_resolve = patterns.size (); - TyTy::TupleType &par = *static_cast (parent); + TyTy::TupleType &par + = *static_cast (resolved_parent); if (patterns.size () != par.get_fields ().size ()) { emit_pattern_size_error (pattern, par.get_fields ().size (), diff --git a/gcc/testsuite/rust/compile/issue-2775.rs b/gcc/testsuite/rust/compile/issue-2775.rs new file mode 100644 index 000000000000..3ad7085785ea --- /dev/null +++ b/gcc/testsuite/rust/compile/issue-2775.rs @@ -0,0 +1,11 @@ +// { dg-options "-w" } +#[lang = "sized"] +pub trait Sized {} + +struct Ref<'a, T> { + x: &'a T, +} + +pub fn test<'a, 'b, 'c>() { + let (_, &&Ref::<(&'_ i32, i32)> { x: &(a, b) }): (i32, &'_ &'b Ref<'b, (&'c i32, i32)>); +} -- 2.47.2