[Bug d/90601] ICE: gimplification failed (gimplify.c at 13436)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90601

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Well, fix_trunc_expr isn't an lvalue you can pre-increment ... if D means
to pre-increment a temporary (and not a) then it has to say so explicitely.
Note GENERIC doesn't allow floating types on {PRE,POST}{DE,IN}CREMENT_EXPR
just in case D does.

A C compiler says the code is invalid C:

t.c: In function ‘f’:
t.c:3:12: error: lvalue required as increment operand
     return ++(a += 1.0);
            ^