Bug 8795 – mixing in "switch" or "interface;" makes dmd segfault

A) mixing in "switch" --- cat > test.d <<code void s() {mixin("switch");} code dmd -c -o- test.d --- test.d(1): Error: found 'EOF' when expecting '(' test.d(1): Error: expression expected, not 'EOF' test.d(1): Error: found 'EOF' when expecting ')' test.d(1): Error: found 'EOF' instead of statement Segmentation fault (core dumped) --- B) mixing in "interface;" --- cat > test.d <<code mixin("interface;"); code dmd -c -o- test.d --- test.d(1): Error: anonymous classes not allowed Segmentation fault (core dumped) ---

In (A), the segfault is happening in SwitchStatement::semantic(Scope*) [statement.c:3101], from attempting to dereference a null pointer (body = body->semantic(sc); where body==NULL). Looks like the body is null because it was an invalid switch mixin, but for some reason the compiler didn't catch the syntax error and proceeded to create a SwitchStatement with a NULL body.

Commit pushed to master at https://github.com/D-Programming-Language/dmd https://github.com/D-Programming-Language/dmd/commit/2d0de85d28e1d953f7590ea6888bc6a12c25bd35 Merge pull request #2504 from quickfur/issue8795 Fix issue 8795: segfault on mixin("switch") and mixin("interface;")