use comprehension instead of map

randolf-scholz · randolf-scholz · commit dc6d63d5e9ad · 2025-12-15T12:23:54.000+01:00
diff --git a/mypy/typeops.py b/mypy/typeops.py
@@ -611,7 +611,7 @@ def make_simplified_union(
         simplified_set = try_contracting_literals_in_union(simplified_set)
 
     # Step 5: Combine Literals and Instances with LKVs, e.g. Literal[1]?, Literal[1] -> Literal[1]?
-    proper_items: list[ProperType] = list(map(get_proper_type, simplified_set))
+    proper_items: list[ProperType] = [get_proper_type(t) for t in simplified_set]
     last_known_values: list[LiteralType | None] = [
         p_t.last_known_value if isinstance(p_t, Instance) else None for p_t in proper_items
     ]

Original file line number	Diff line number	Diff line change
`@@ -611,7 +611,7 @@ def make_simplified_union(`
`611`	`611`	`simplified_set = try_contracting_literals_in_union(simplified_set)`
`612`	`612`
`613`	`613`	`# Step 5: Combine Literals and Instances with LKVs, e.g. Literal[1]?, Literal[1] -> Literal[1]?`
`614`		`- proper_items: list[ProperType] = list(map(get_proper_type, simplified_set))`
	`614`	`+ proper_items: list[ProperType] = [get_proper_type(t) for t in simplified_set]`
`615`	`615`	`last_known_values: list[LiteralType \| None] = [`
`616`	`616`	`p_t.last_known_value if isinstance(p_t, Instance) else None for p_t in proper_items`
`617`	`617`	`]`