Bug 10219 – Implicit conversion between delegates returning a class and an interface

--- interface I { } class C: I { } void f(I delegate(C) del) { C c = new C; void* cPtr = cast(void*) c; void* iPtr = cast(void*) cast(I) c; void* delPtr = cast(void*) del(c); assert(cPtr != iPtr); assert(cPtr != delPtr); // fails assert(iPtr == delPtr); // fails } // Incorrect implicit conversion example static assert(!__traits(compiles, f(delegate C(C c) { return c; }))); // fails void main() { // As a result wrong code is generated for lambdas f(c => c); // creates delegate C(C), not I(C) } ---

Commits pushed to master at https://github.com/D-Programming-Language/dmd https://github.com/D-Programming-Language/dmd/commit/0c17ec66daa5a16dd8012685c37e4a775b1d8c1a fix Issue 10219 - Implicit conversion between delegates returning a class and an interface https://github.com/D-Programming-Language/dmd/commit/3282cc306b36eeff34ea616b243058d0d0ab0e8d Merge pull request #3576 from 9rnsr/fix10219 Issue 10219 - Implicit conversion between delegates returning a class and an interface