Skip attribute suggestions for partial union failures #2149
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When an attribute exists on some union members but not others, skip suggestions to avoid misleading guidance. For example, x.split() on str | None should not suggest rsplit since it also doesn't exist on None. Fixes facebook#2108
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When an attribute exists on some union members but not others, skip suggestions to avoid misleading guidance. For example, x.split() on str | None should not suggest rsplit since it also doesn't exist on None.
Fixes #2108
Summary
Modified
type_of_attr_getinpyrefly/lib/alt/attr.rsto detect partial union failures (where an attribute exists on some union members but not others) and skip suggestions in those cases. This prevents misleading suggestions like recommendingrsplitwhensplitfails onstr | None.The fix checks if
foundandnot_foundare both non-empty before suggesting, indicating the attribute exists on some union members but not all.Suggestions still work correctly when the attribute is missing on all union members or when there's no union involved.
Test Plan
Added 5 comprehensive test cases in
pyrefly/lib/test/attributes.rs:test_union_attribute_missing_no_suggestion- Core fix (str | None)test_union_attribute_missing_no_suggestion_three_types- Three-type uniontest_union_attribute_missing_no_suggestion_mostly_have_it- Two have it, one doesn'ttest_union_both_missing_should_suggest- All missing (should still suggest)test_union_all_have_attribute_no_error- All have it (no error)All tests pass (
cargo test test_union). Manually verified with release build that the fix works as expected.