https://issues.dlang.org/show_bug.cgi?id=13921
Issue ID: 13921 Summary: ICE with template instantiation error Product: D Version: D2 Hardware: All OS: All Status: NEW Keywords: ice-on-invalid-code Severity: regression Priority: P1 Component: DMD Assignee: nob...@puremagic.com Reporter: sinkuup...@gmail.com Compiler crashes with the code below. This is introduced in https://github.com/D-Programming-Language/dmd/pull/4091 Code: struct S(N) { void fun() { undefined_identifier; // or anything that makes the instantiation fail } } void test(T)(S!T) { } void main() { S!string g; test(g); } Output: % dmd | head -n1 DMD64 D Compiler v2.067-devel-60bdb8c % dmd -c test.d test.d(5): Error: undefined identifier undefined_identifier test.d(16): Error: template instance test.S!string error instantiating dmd: template.c:2621: FuncDeclaration* TemplateDeclaration::doHeaderInstantiation(TemplateInstance*, Scope*, FuncDeclaration*, Type*, Expressions*): Assertion `fd->type->ty != Tfunction' failed. --