No type checking when a method's body is just a variable name

[IsaacOscar]

Consideer this code:

method foo(x: interface{foo})->interface{bar} { x }
foo(object{})

Runing this through mgc causes no runtime errors.
However if I change foo's body to {done; x}. I get runtime errors as expected.

Note this happens whenever the method body is a single variable name (even if not a method paramater), and effects both paramater and return type checks.

[apblack]

This is deliberate — its an optimisation to make simple accessors reasonably fast. Maybe this is misguided?

[apblack]

Commit d2ae13d restricts this optimization to methods that don't have parameters (and are not once methods). There is now a test for this case in t020 test case "once methods and accessor methods".