[C++ Patch] PR 84330 ("[6/7/8 Regression] [concepts] ICE with broken constraint")

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

we have been accumulating quite a few bugs under the [concepts] 
meta-bug, most of which of course aren't regressions. This one is a low 
hanging fruit, an error recovery issue where, after some meaningful 
diagnostic, tsubst_constraint doesn't know how to handle an 
error_mark_node. I believe that ideally we should do better, we should 
be able to issue only the first error - I think a TODO in 
diagnose_constraint hints at that too - but the below should do for now 
(well, in 6.1.0 we issued *3* errors ;-)

Thanks, Paolo.

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