Backtrace:
Program received signal SIGSEGV, Segmentation fault.
0x0000000000459fea in gfc_add_explicit_interface (sym=0xdf78a0,
source=IFSRC_DECL, formal=0xdee3c0, where=0xcf6970)
at /home/tob/projects/gcc/gcc/fortran/symbol.c:1207
1207 if (current_interface.ns
(gdb) bt
#0 0x0000000000459fea in gfc_add_explicit_interface (sym=0xdf78a0,
source=IFSRC_DECL, formal=0xdee3c0, where=0xcf6970)
at /home/tob/projects/gcc/gcc/fortran/symbol.c:1207
#1 0x0000000000413b2f in gfc_match_formal_arglist (progname=0xdf78a0,
st_flag=1, null_flag=14607296)
at /home/tob/projects/gcc/gcc/fortran/decl.c:2693
#2 0x0000000000435c06 in gfc_match_st_function () at
/home/tob/projects/gcc/gcc/fortran/match.c:2937
#3 0x0000000000441083 in match_word (str=0xdf78d8 "", subr=0x435b90
<gfc_match_st_function>, old_locus=0x7fff4b554a60)
at /home/tob/projects/gcc/gcc/fortran/parse.c:65