gccrs: add error check if derive has wrong item #4211
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Derive may only be applied to structs, enums and unions. gcc/rust/ChangeLog: * expand/rust-derive.cc (DeriveVisitor::derive): Add check and error. gcc/testsuite/ChangeLog: * rust/compile/issue-3971.rs: New test. Signed-off-by: Lucas Ly Ba <lucas.ly-ba@outlook.com>
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Derive may only be applied to structs, enums and unions.
Fixes #3971
gcc/rust/ChangeLog:
gcc/testsuite/ChangeLog:
Signed-off-by: Lucas Ly Ba lucas.ly-ba@outlook.com