Bug 20795 – [dip1000] segfault on templated opEquals

Compile following with `dmd -dip1000` and you get a segfault in dmd.func.FuncDeclaration.setUnsafe(). It has been reduced with dustmite so the code might not make sense. If the opEquals in Bar is converted from template to regular function we get a good error message, same with the opCast in Bar. --- import std; alias NamedArg = Tuple!Bar; struct Foo { VariantN!24 variant; bool opEquals(T)(T rhs) { variant.opEquals(rhs); } } struct Bar { bool opEquals()(Bar ) { return Gun() == Foo.init; } } class Baz { T opCast(T)() { } } struct Gun { void[24] buff; auto underlying() { return cast(Baz)buff.ptr; } alias underlying this; } ---

Reduced example: struct Foo { void opEquals(T)(T rhs) if (T.init.opCast!string) {} } struct Bar { void opEquals()(Bar) { Gun() == Foo.init; } } class Baz { void opCast(T)() {} } struct Gun { void[24] buff; auto underlying() { return cast(Baz) buff.ptr; } alias underlying this; } struct Tuple { Bar expand; void opEquals(R)(R) if (mixin("Tuple.init.expand == R.init")) {} }

(In reply to moonlightsentinel from comment #1) Tuple isn't required: struct Foo { void opEquals(T)(T rhs) if (T.init.opCast!string) {} } struct Bar { void opEquals()(Bar) { Gun() == Foo.init; } } class Baz { void opCast(T)() {} } struct Gun { void[24] buff; auto underlying() { return cast(Baz) buff.ptr; } alias underlying this; void opEquals(R)(R) if (mixin("Bar.init == R.init")) {} }

@RazvanN7 created dlang/dmd pull request #11096 "Fix Issue 20795 - [dip1000] segfault on templated opEquals" fixing this issue: - Fix Issue 20795 - [dip1000] segfault on templated opEquals https://github.com/dlang/dmd/pull/11096

dlang/dmd pull request #11096 "Fix Issue 20795 - [dip1000] segfault on templated opEquals" was merged into stable: - bb64fe491abd5f09ebd6aaabf4c7f47ec9a39c36 by RazvanN7: Fix Issue 20795 - [dip1000] segfault on templated opEquals https://github.com/dlang/dmd/pull/11096