https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113412
--- Comment #6 from anlauf at gcc dot gnu.org --- (In reply to kargls from comment #5) > The pointers to expr->symtree is NULL. This new patch catches your example. It does, but behaves weird for some other cases. Try: program main complex :: c = 1. complex, parameter :: z = 1. print *, atan(c,c) print *, atan(z,z) end This gives now: pr113412.f90:4:18: 4 | print *, atan(c,c) | 1 Error: 'c' argument of 'atan' intrinsic at (1) must be the same type and kind as 'c' pr113412.f90:5:18: 5 | print *, atan(z,z) | 1 Error: 'z' argument of 'atan' intrinsic at (1) must be the same type and kind as 'z' I wonder whether we can reuse existing checks for atan2 for the 2-argument version of atan. I tried the following: diff --git a/gcc/fortran/intrinsic.cc b/gcc/fortran/intrinsic.cc index c35f2bdd183..261d4229139 100644 --- a/gcc/fortran/intrinsic.cc +++ b/gcc/fortran/intrinsic.cc @@ -4370,6 +4370,11 @@ sort_actual (const char *name, gfc_actual_arglist **ap, if (a == NULL) goto do_sort; + if ((gfc_option.allow_std & GFC_STD_F2008) != 0 + && strcmp(name, "atan") == 0 + && !gfc_check_atan_2 (actual->expr, actual->next->expr)) + return false; + whoops: gfc_error ("Too many arguments in call to %qs at %L", name, where); return false; This is indeed sort of hackish and produces for testcase: program main complex :: c = 1. print *, atan (c,c) print *, atan2(c,c) end pr113412.f90:3:17: 3 | print *, atan (c,c) | 1 Error: 'x' argument of 'atan' intrinsic at (1) must be REAL pr113412.f90:4:17: 4 | print *, atan2(c,c) | 1 Error: 'y' argument of 'atan2' intrinsic at (1) must be REAL Note that the name of the formal argument is now wrong, probably because the association of actuals with formals is missing.