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Transitive import without annotation

pyrefly/test_laziness/test_transitive_import_unannotated.md

1.1.0-dev.11.1 KB
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Transitive import without annotation

a imports value from b, where value = compute() has no type annotation. compute() is defined in c with -> int.

b -> c::KeyExport("compute") resolves the function to determine value's type. Its children show c resolving int from builtins. a -> b::KeyExport("value") then gets the resolved type.

All demands are necessary — without an annotation on value, the type must be inferred by resolving the call chain. No superfluous demands.

Files

a.py:

python
from b import value
x = value + 1

b.py:

python
from c import compute
value = compute()

c.py:

python
def compute() -> int: return 42

Check a.py

expected
a: Solutions
b: Answers
c: Answers

(168 builtin demands hidden)
a -> b::Load(module_exists)
a -> b::Exports(export_exists)
a -> b::Exports(get_deprecated)
a -> b::KeyExport(Name("value"))
  b -> c::Exports(is_special_export)
  b -> c::Exports(is_special_export)
  b -> c::Exports(export_exists)
  b -> c::Exports(get_deprecated)
  b -> c::KeyExport(Name("compute"))