Fix collections.namedtuple not recognized when collections.abc is imported

pyrefly/lib/binding/scope.rs

@@ -1879,9 +1879,15 @@ impl Scopes {
             // is a special export.
             let value = self.get_flow_info(base_name)?.value()?;
             match &value.style {
-                FlowStyle::MergeableImport(m) | FlowStyle::ImportAs(m) => {
-                    lookup.is_special_export(*m, name)
+                FlowStyle::MergeableImport(m) => {
+                    // For dotted imports like `import collections.abc`, the base module `collections`
+                    // is also implicitly imported, so we should check that too.
+                    let base_module = ModuleName::from_name(base_name);
+                    lookup
+                        .is_special_export(*m, name)
+                        .or_else(|| lookup.is_special_export(base_module, name))
                 }
+                FlowStyle::ImportAs(m) => lookup.is_special_export(*m, name),
                 FlowStyle::Import(m, upstream_name) => lookup.is_special_export(*m, upstream_name),
                 _ => None,
             }

pyrefly/lib/test/named_tuple.rs

@@ -598,3 +598,28 @@ class QConfig(namedtuple("QConfig", ["activation", "weight"])):
         return super().__new__(cls, activation, weight)
 "#,
 );
+
+// Regression test for https://github.com/facebook/pyrefly/issues/2622
+// `import collections.abc` should not break special handling of `collections.namedtuple`.
+testcase!(
+    test_named_tuple_collections_submodule_import,
+    r#"
+import collections
+import collections.abc
+
+Point = collections.namedtuple("Point", ["x", "y"])
+p = Point(x=1, y=2)
+    "#,
+);
+
+// `import collections.abc` alone (without explicit `import collections`) should still
+// allow `collections.namedtuple` to work, since `import X.Y` implicitly imports `X`.
+testcase!(
+    test_named_tuple_collections_submodule_import_only,
+    r#"
+import collections.abc
+
+Point = collections.namedtuple("Point", ["x", "y"])
+p = Point(x=1, y=2)
+    "#,
+);