https://issues.dlang.org/show_bug.cgi?id=13417
--- Comment #3 from hst...@quickfur.ath.cx --- I managed to reduce the test case a little more: ------ struct Vector(string x, E) { } void someFunc(E)(Vector!("", E)) { } void main() { someFunc(Vector!("", float)()); } ------ Here's the compiler stacktrace under gdb: ------ Program received signal SIGSEGV, Segmentation fault. 0x000000000047670a in ctfeInterpret(Expression*) () (gdb) bt #0 0x000000000047670a in ctfeInterpret(Expression*) () #1 0x000000000045793a in deduceType(RootObject*, Scope*, Type*, Array<TemplateParameter*>*, Array<RootObject*>*, unsigned int*, unsigned long)::DeduceType::visit(TypeInstance*) () #2 0x0000000000456734 in deduceType(RootObject*, Scope*, Type*, Array<TemplateParameter*>*, Array<RootObject*>*, unsigned int*, unsigned long) () #3 0x0000000000457307 in deduceType(RootObject*, Scope*, Type*, Array<TemplateParameter*>*, Array<RootObject*>*, unsigned int*, unsigned long)::DeduceType::visit(TypeStruct*) () #4 0x000000000045a93d in deduceType(RootObject*, Scope*, Type*, Array<TemplateParameter*>*, Array<RootObject*>*, unsigned int*, unsigned long)::DeduceType::visit(Expression*) () #5 0x0000000000456717 in deduceType(RootObject*, Scope*, Type*, Array<TemplateParameter*>*, Array<RootObject*>*, unsigned int*, unsigned long) () #6 0x0000000000459238 in TemplateDeclaration::deduceFunctionTemplateMatch(TemplateInstance*, Scope*, FuncDeclaration*&, Type*, Array<Expression*>*) () #7 0x00000000004635ab in functionResolve(Match*, Dsymbol*, Loc, Scope*, Array<RootObject*>*, Type*, Array<Expression*>*)::ParamDeduce::fp(void*, Dsymbol*) () #8 0x00000000004f9d93 in overloadApply(Dsymbol*, void*, int (*)(void*, Dsymbol*)) () #9 0x0000000000462ebf in functionResolve(Match*, Dsymbol*, Loc, Scope*, Array<RootObject*>*, Type*, Array<Expression*>*) () #10 0x00000000004faabd in resolveFuncCall(Loc, Scope*, Dsymbol*, Array<RootObject*>*, Type*, Array<Expression*>*, int) () #11 0x00000000004e1839 in CallExp::semantic(Scope*) [clone .part.122] () #12 0x0000000000441d0b in ExpStatement::semantic(Scope*) () #13 0x000000000044683f in CompoundStatement::semantic(Scope*) () #14 0x00000000004fc94a in FuncDeclaration::semantic3(Scope*) () #15 0x0000000000407d48 in Module::semantic3() () #16 0x0000000000405484 in tryMain(unsigned long, char const**) () #17 0x00007ffff70b5eed in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6 #18 0x0000000000402c75 in _start () ------ --