The following code compiles with ldc/dmd but not with gdc:
cat test.d
void main() { int[] count; { import std.string; ++count[3]; } }
gdc test.d
test.d:8:16: error: only one index allowed to index void ++count[3]; ^
gdc --version
gdc (Debian 6.3.0-18+deb9u1) 6.3.0 20170516 Copyright (C) 2016 Free Software Foundation, Inc.This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Is this a bug?