Add some type annotations

Author: JukkaL

mypyc/irbuild/mapper.py

@@ -178,7 +178,7 @@ def fdef_to_sig(self, fdef: FuncDef, strict_dunders_typing: bool) -> FuncSignatu
                 # Give a more precise type for generators, so that we can optimize
                 # code that uses them. They return a generator object, which has a
                 # specific class. Without this, the type would have to be 'object'.
-                ret = RInstance(self.fdef_to_generator[fdef])
+                ret: RType = RInstance(self.fdef_to_generator[fdef])
             else:
                 ret = self.type_to_rtype(fdef.type.ret_type)
         else:

mypyc/irbuild/statement.py

@@ -939,7 +939,7 @@ def emit_yield_from_or_await(
         and val.type.class_ir.has_method(helper_method)
     ):
         # This is a generated generator class, and we can use a fast path.
-        iter_val = val
+        iter_val: Value = val
     else:
         get_op = coro_op if is_await else iter_op
         if isinstance(get_op, PrimitiveDescription):