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gccrs: fixed compiler error message on wildcard pattern within expression

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gcc/rust/ChangeLog:

	* parse/rust-parse-impl.h (Parser::null_denotation): Add proper error
	when seeing wildcard var on right side of assignment.

gcc/testsuite/ChangeLog:

	* rust/compile/issue-867.rs: New test.

Signed-off-by: Abdul Rafey <abdulrafeyq@gmail.com>
This commit is contained in:
Abdul Rafey
2023-01-29 17:05:23 +05:30
committed by Arthur Cohen
parent d6cb04bf5c
commit 760f529d81
2 changed files with 14 additions and 0 deletions
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6
gcc/rust/parse/rust-parse-impl.h
View File

@@ -13021,6 +13021,12 @@ Parser<ManagedTokenSource>::null_denotation (const_TokenPtr tok,
case UNSAFE:
return parse_unsafe_block_expr (std::move (outer_attrs),
tok->get_locus ());
case UNDERSCORE:
add_error (
Error (tok->get_locus (),
"use of %qs is not allowed on the right-side of an assignment",
tok->get_token_description ()));
return nullptr;
default:
if (!restrictions.expr_can_be_null)
add_error (Error (tok->get_locus (),

8
gcc/testsuite/rust/compile/issue-867.rs Normal file
View File

@@ -0,0 +1,8 @@
fn main() {
let _ = 42;
let a = _ + 123; // { dg-error "use of '_' is not allowed on the right-side of an assignment" }
// { dg-error {failed to parse expression in let statement} "" { target *-*-* } .-1 }
// { dg-error {failed to parse statement or expression without block in block expression} "" { target *-*-* } .-2 }
// { dg-error {unrecognised token '\}' for start of item} "" { target *-*-* } .+2 }
// { dg-error {failed to parse item in crate} "" { target *-*-* } .+1 }
}