[C++ Patch] PR 12288

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

Hi,

this is also by and large fixed, but we can do a bit better in terms of 
not producing a:

error: ISO C++ forbids declaration of ‘parameter’ with no type 
[-fpermissive]

after a meaningful error. In grokdeclarator there is already a mechanism 
to suppress those, but in cp_parser_parameter_declaration we fail to 
check the return value cp_parser_parse_and_diagnose_invalid_type_name.

Tested x86_64-linux.

Thanks,
Paolo.

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Attachment: CL_12288
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Attachment: patch_12288
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