PEP 593 Annotated containing string literal is marked incorrect

[Richardk2n]

Bug Report

Annotated as descirbed by PEP 593 should work according to #7021 but does not if the Annotated is annotating a function parameter and contains a string literal, that is not itself a function parameter. Se examples below.

To Reproduce

a: Annotated[str, "metadata"] is fine
def f(a: Annotated[str, str("metadata")]): is also fine
def f(a: Annotated[str, "metadata"]): gives Name 'metadata' is not defined

Expected Behavior

All thre examples should be valid

Actual Behavior

They are not.

Your Environment

• Mypy version used:master branch as of time of writing
• Mypy command-line flags:
• Mypy configuration options from mypy.ini (and other config files):
• Python version used:3.9.1
• Operating system and version:Windows 10

[gvanrossum]

Confirmed on master branch -- the last example gives Name 'metadata' is not defined.