Merge pull request swiftlang#10469 from jckarter/c-pointer-to-nested-function-in-generic

SILGen: Remove assertion that rejected context-free nested functions in generic contexts when referenced as C function pointers.

Author: jckarter

lib/SILGen/SILGenExpr.cpp

@@ -1483,8 +1483,6 @@ ManagedValue emitCFunctionPointer(SILGenFunction &gen,
     // in the metatype.
     assert(!declRef.getDecl()->getDeclContext()->isTypeContext()
            && "c pointers to static methods not implemented");
-    assert(declRef.getSubstitutions().empty()
-           && "c pointers to generics not implemented");
     loc = declRef.getDecl();
   };
 

test/SILGen/c_function_pointers.swift

@@ -63,3 +63,9 @@ struct StructWithInitializers {
   init(a: ()) {}
   init(b: ()) {}
 }
+
+func pointers_to_nested_local_functions_in_generics<T>(x: T) -> Int{
+  func foo(y: Int) -> Int { return y }
+
+  return calls(foo, 0)
+}