Fix #2662: Don't convert subtype typedesc params

There is no point to issue implicit HiddenStdConv encountering subtype of
typedesc[Base] parameter on overload resolution, since this will anyway never
reach codegen. This change effectively fixes compiler bug for:

  iterator it(T: typedesc[Base]) = ...
  for s in it(SubclassOfBase): ...

Where HiddenStdConv triggered implicit instantiation of variable of type
typedesc[Base] in for transform, that eventually fails at getUniqueType, that
refuses to work for typedesc.

0 files changed, 0 insertions, 0 deletions