[Bug c++/51318] [4.7 Regression] segfault on Eigen3

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51318

--- Comment #6 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-12-04 16:32:52 UTC ---
For some reason, in mainline tsubst_template_arg (thus tsubst_expr ->
tsubst_copy_and_build, which crashes because TREE_TYPE (r) is null) handles an
INDIRECT_REF (with a COND_EXPR as arg 0) instead of a COND_EXPR.