[C++ Patch] PR 60376

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

Hi,

in this -std=c++1y regression we ICE on invalid code during error recovery:

60376.C: In function ‘void bar()’:
60376.C:8:9: error: expected nested-name-specifier before ‘(’ token
using (A().foo);
^
60376.C:8:9: error: expected unqualified-id before ‘(’ token
60376.C:8:9: error: expected ‘;’ before ‘(’ token
60376.C:8:18: error: statement cannot resolve address of overloaded function
using (A().foo);
^
60376.C:8:9: internal compiler error: ...

I think we can take the occasion to handle the issue early, in the 
parser, thus cleaning up the diagnostic we emit in such cases, that is, 
emit only the first error message (to achieve that I used the same 
approach already used elsewhere: detect the hard error condition and 
skip). Tested x86_64-linux.

Thanks,
Paolo.

PS: Submitter posted also an ICE on valid issue, which seems separate to me.

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Attachment: CL_60376
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Attachment: patch_60376
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