Able variables through different functions compile

compiler/can/src/def.rs

@@ -478,6 +478,10 @@ pub fn canonicalize_defs<'a>(
                 }
             };
 
+            if pattern_type == PatternType::TopLevelDef {
+                env.top_level_symbols.insert(member_sym);
+            }
+
             // What variables in the annotation are bound to the parent ability, and what variables
             // are bound to some other ability?
             let (variables_bound_to_ability, variables_bound_to_other_abilities): (Vec<_>, Vec<_>) =

compiler/test_gen/src/gen_abilities.rs

@@ -84,3 +84,26 @@ fn alias_member_specialization() {
         u64
     );
 }
+
+#[test]
+fn ability_constrained_in_non_member_usage() {
+    assert_evals_to!(
+        indoc!(
+            r#"
+            app "test" provides [ result ] to "./platform"
+
+            Hash has
+                hash : a -> U64 | a has Hash
+
+            mulHashes = \x, y -> hash x * hash y
+
+            Id := U64
+            hash = \$Id n -> n
+
+            result = mulHashes ($Id 5) ($Id 7)
+            "#
+        ),
+        35,
+        u64
+    )
+}