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From: Thomas Schwinge <tschwinge@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc/devel/rust/master] parser: Add 0 sized slice pattern parsing Date: Sun, 5 Mar 2023 11:42:04 +0000 (GMT) [thread overview] Message-ID: <20230305114204.F031E3858417@sourceware.org> (raw) https://gcc.gnu.org/g:baf5c546b59058fcc5aac430e8fbe6e99d355634 commit baf5c546b59058fcc5aac430e8fbe6e99d355634 Author: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com> Date: Wed Mar 1 18:46:33 2023 +0100 parser: Add 0 sized slice pattern parsing Check for a closing square bracket before attempting to parse any pattern within a slice. Also add a new test to verify zero sized slice parsing. gcc/rust/ChangeLog: * parse/rust-parse-impl.h (Parser::parse_slice_pattern): Add closing square bracket check. gcc/testsuite/ChangeLog: * rust/compile/zero_sized_slice.rs: New test. Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com> Diff: --- gcc/rust/parse/rust-parse-impl.h | 9 ++++++++- gcc/testsuite/rust/compile/zero_sized_slice.rs | 5 +++++ 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/gcc/rust/parse/rust-parse-impl.h b/gcc/rust/parse/rust-parse-impl.h index 15effaa1979..b17744fedaa 100644 --- a/gcc/rust/parse/rust-parse-impl.h +++ b/gcc/rust/parse/rust-parse-impl.h @@ -11136,8 +11136,16 @@ std::unique_ptr<AST::SlicePattern> Parser<ManagedTokenSource>::parse_slice_pattern () { Location square_locus = lexer.peek_token ()->get_locus (); + std::vector<std::unique_ptr<AST::Pattern>> patterns; skip_token (LEFT_SQUARE); + if (lexer.peek_token ()->get_id () == RIGHT_SQUARE) + { + skip_token (RIGHT_SQUARE); + return std::unique_ptr<AST::SlicePattern> ( + new AST::SlicePattern (std::move (patterns), square_locus)); + } + // parse initial pattern (required) std::unique_ptr<AST::Pattern> initial_pattern = parse_pattern (); if (initial_pattern == nullptr) @@ -11149,7 +11157,6 @@ Parser<ManagedTokenSource>::parse_slice_pattern () return nullptr; } - std::vector<std::unique_ptr<AST::Pattern>> patterns; patterns.push_back (std::move (initial_pattern)); const_TokenPtr t = lexer.peek_token (); diff --git a/gcc/testsuite/rust/compile/zero_sized_slice.rs b/gcc/testsuite/rust/compile/zero_sized_slice.rs new file mode 100644 index 00000000000..cd1e21e7b33 --- /dev/null +++ b/gcc/testsuite/rust/compile/zero_sized_slice.rs @@ -0,0 +1,5 @@ +// { dg-options "-fsyntax-only" } + +fn foo() { + let [] = [0; 0]; +}
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