[C++ Patch] PR 94034 ("[10 Regression] Broken diagnostic: 'result_decl' not supported by dump_expr")

[Paolo Carlini]

Hi,

in this apparently simple regression we end up producing garbled 
diagnostic because dump_expr (called via verify_constant) doesn't handle 
RESULT_DECL. I think it makes sense to add the tree code together with 
all the other *_DECL. Tested x86_64-linux.

Thanks, Paolo.

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