[C++ Patch] PR 56060

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

Hi,

in this old (Jakub figured out it already existed in 2007!) ICE on 
invalid, the problem happens in type_dependent_expression_p: the code 
for unknown_type_node as TREE_TYPE of the expression doesn't handle 
EXPR_PACK_EXPANSION as TREE_CODE.

It seems to me that we simply have to look inside the expression via 
PACK_EXPANSION_PATTERN: in the testcase, for "bar<U> ..." as expression 
the _PATTERN is a TEMPLATE_ID_EXPR which then is normally handled. 
Tested x86_64-linux.

Thanks,
Paolo.

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Attachment: patch_56060
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