gccrs: fix ICE for empty enum variant - #4081
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powerboat9
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gcc/rust/ChangeLog: * rust-gcc.cc (constructor_expression): Ensure vec_alloc reserves at least one element. gcc/testsuite/ChangeLog: * rust/compile/issue-3947.rs: New test. Signed-off-by: lishin <lishin1008@gmail.com>
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Fixes #3947
gcc/rust/ChangeLog:
gcc/testsuite/ChangeLog: