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[red-knot] Ban most Type::Instance types in type expressions (#16872)

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## Summary

Catch some Instances, but raise type error for the rest of them
Fixes #16851 

## Test Plan

Extend invalid.md in annotations

---------

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
This commit is contained in:
Matthew Mckee
2025-03-20 22:19:56 +00:00
committed by GitHub
parent 296d67a496
commit 63e78b41cd
6 changed files with 144 additions and 69 deletions
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46
crates/red_knot_python_semantic/resources/mdtest/annotations/invalid.md
View File

@@ -9,6 +9,8 @@ import typing
from knot_extensions import AlwaysTruthy, AlwaysFalsy
from typing_extensions import Literal, Never
class A: ...
def _(
a: type[int],
b: AlwaysTruthy,
@@ -18,30 +20,34 @@ def _(
f: Literal[b"foo"],
g: tuple[int, str],
h: Never,
i: int,
j: A,
):
def foo(): ...
def invalid(
i: a, # error: [invalid-type-form] "Variable of type `type[int]` is not allowed in a type expression"
j: b, # error: [invalid-type-form]
k: c, # error: [invalid-type-form]
l: d, # error: [invalid-type-form]
m: e, # error: [invalid-type-form]
n: f, # error: [invalid-type-form]
o: g, # error: [invalid-type-form]
p: h, # error: [invalid-type-form]
q: typing, # error: [invalid-type-form]
r: foo, # error: [invalid-type-form]
a_: a, # error: [invalid-type-form] "Variable of type `type[int]` is not allowed in a type expression"
b_: b, # error: [invalid-type-form]
c_: c, # error: [invalid-type-form]
d_: d, # error: [invalid-type-form]
e_: e, # error: [invalid-type-form]
f_: f, # error: [invalid-type-form]
g_: g, # error: [invalid-type-form]
h_: h, # error: [invalid-type-form]
i_: typing, # error: [invalid-type-form]
j_: foo, # error: [invalid-type-form]
k_: i, # error: [invalid-type-form] "Variable of type `int` is not allowed in a type expression"
l_: j, # error: [invalid-type-form] "Variable of type `A` is not allowed in a type expression"
):
reveal_type(i) # revealed: Unknown
reveal_type(j) # revealed: Unknown
reveal_type(k) # revealed: Unknown
reveal_type(l) # revealed: Unknown
reveal_type(m) # revealed: Unknown
reveal_type(n) # revealed: Unknown
reveal_type(o) # revealed: Unknown
reveal_type(p) # revealed: Unknown
reveal_type(q) # revealed: Unknown
reveal_type(r) # revealed: Unknown
reveal_type(a_) # revealed: Unknown
reveal_type(b_) # revealed: Unknown
reveal_type(c_) # revealed: Unknown
reveal_type(d_) # revealed: Unknown
reveal_type(e_) # revealed: Unknown
reveal_type(f_) # revealed: Unknown
reveal_type(g_) # revealed: Unknown
reveal_type(h_) # revealed: Unknown
reveal_type(i_) # revealed: Unknown
reveal_type(j_) # revealed: Unknown
```
## Invalid AST nodes