https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61392
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
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Keywords| |ice-on-invalid-code
--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
The use of ddx without reference to a B object is only allowed if it is the
whole unevaluated operand, i.e. decltype(ddx). Here it's used in an
expression, which is ill-formed. So, ice on invalid.
