gccrs: Fix ICE on enum struct-variant patterns - #4817
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StructPattern::is_refutable asserted that the ADT was not an enum, so struct patterns naming enum variants hit the assert. Return true for multi-variant enums and continue with the existing field checks for single-variant enums. Fixes Rust-GCC#4739 gcc/rust/ChangeLog: * hir/tree/rust-hir-pattern-abstract.cc (StructPattern::is_refutable): Handle enum patterns with multiple variants. gcc/testsuite/ChangeLog: * rust/compile/irrefutable-struct-variant.rs: New test. * rust/compile/refutable-struct.rs: Add regression tests for enum variant patterns in function parameters and let bindings. Signed-off-by: Utkarsh Bahuguna <utkarshbahuguna10@gmail.com>
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Fixes #4739
StructPattern::is_refutable asserted that the ADT was not an enum, so struct patterns naming enum variants hit the assert. Return true for multi-variant enums and continue with the existing field checks for single-variant enums.
make check-rust passes cleanly with no unexpected failures.
This is independent of #4808. It changes a different function in the same file and the two changes do not overlap.