| // RUN: %target-swift-frontend -typecheck %s -verify |
| // REQUIRES: asserts |
| |
| // TF-1017: `@differentiable` attribute type-checking crash when original |
| // declaration has an error type. |
| |
| protocol P: Differentiable { |
| @differentiable |
| init(x: Float) |
| } |
| extension P { |
| @differentiable |
| // expected-error @+1 {{generic parameter 'U' is not used in function signature}} |
| init<U>(_ x: Float) { |
| self.init(x: x) |
| } |
| } |
| extension P where Self: FloatingPoint { |
| @differentiable |
| func hello(_ x: Float) -> Self { |
| .init(x: x) |
| } |
| } |
| |
| // Assertion failed: (isa<X>(Val) && "cast<Ty>() argument of incompatible type!"), function cast, file llvm/include/llvm/Support/Casting.h, line 264. |
| // Assertion failed: (D), function printDifferentiableAttrArguments, file swift/lib/AST/Attr.cpp, line 493. |
