gccrs: empty match expressions should resolve to ! #3256
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gcc/rust/ChangeLog: * hir/rust-hir-dump.cc (Dump::visit): add guards Signed-off-by: Philip Herron <herron.philip@googlemail.com>
This is a special case in Rust and the ! type can unify with pretty much anything its almost a inference variable and a unit-type for special cases. Fixes #3231 Fixes #2567 gcc/rust/ChangeLog: * backend/rust-compile-expr.cc (check_match_scrutinee): check for empty match (CompileExpr::visit): fix assertion * checks/errors/rust-hir-pattern-analysis.cc (check_match_usefulness): check for empty * typecheck/rust-hir-type-check-expr.cc (TypeCheckExpr::visit): resolve to ! gcc/testsuite/ChangeLog: * rust/compile/exhaustiveness1.rs: remove bad check * rust/compile/issue-2567-1.rs: New test. * rust/compile/issue-2567-2.rs: New test. * rust/compile/issue-2567-3.rs: New test. * rust/compile/issue-3231.rs: New test. Signed-off-by: Philip Herron <herron.philip@googlemail.com>
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This is a special case in Rust and the ! type can unify with pretty much
anything its almost a inference variable and a unit-type for special cases.
Fixes #3231
Fixes #2567