https://issues.dlang.org/show_bug.cgi?id=4149

Andrei Alexandrescu <andrei@erdani.com> changed...

...phobos and I'm an expert with GDB. That's not the issue. The issue...

Apparently GDB couldn't stack trace the error with symbols, was limited to 2 frames...

...1.
0x0000000000ccd8f7 in ?? ()
(gdb) bt
#0  0x0000000000ccd8f7 in ?? ()
#1  0x0000000000000000 in ?? ()
(gdb) c
Continuing.

Program...

...the program entirely? Maybe your version of gdb has a bug in reading D debugging...

...gdb)
                #34 0x0000000000610d3a catch_errors (gdb)
                #35 0x000000000061568b gdb_main (gdb)
                #36 0x00000000004604a5 main (gdb...

...run the program in gdb:

$ dmd b.d -g

$ gdb b
(gdb) r

Program received...

...accidentally building all of binutils instead.  Use 'make all-gdb' and enjoy faster builds :-p

...C build times.
Excuse me while I go take half an hour to build GDB.

...you want to set a breakpoint with GDB). When Vibe.d's main is called...