schema: Fix `std` module resolution.
Resolve implicit builtin `std` the same way as when it is explicitly
specified.
@@ -218,8 +218,8 @@ class Schema(TypeContainer):
return result
if implicit_builtins:
- std = self.modules['std']
- result = getter([std], nqname)
+ std = self._resolve_module('std')
+ result = getter(std, nqname)
if result is not None:
return result
