Issue #1071: Add a test (not yet the test case given in the issue)
Issue #1071: Use the return type of the anonymous Callable as the expected type of the expression
Issue #1071: Now update test to cover the case given in the issue (I can't reporduce Gavin's success with 0.0)
Minor
Issue #1071: Use a raw Callable in the let for a MethodArgument to a NamedArgumentInvocation, because figuring out the type argument seems to be impossible
Issue #1071: Make test harder
Issue #1071: Fix existing .src for the new raw Callable in the transformation of MethodParameter