Unify ranged numbers with flex able, modulo obligation checking

Closes #4594

crates/compiler/unify/src/unify.rs

@@ -650,7 +650,18 @@ fn unify_ranged_number<M: MetaCollector>(
             // Int a vs Int <range>, the rigid wins
             merge(env, ctx, RigidVar(*name))
         }
-        RecursionVar { .. } | Alias(..) | Structure(..) | RigidAbleVar(..) | FlexAbleVar(..) => {
+        FlexAbleVar(_, abilities) => {
+            // Range wins, modulo obligation checking.
+            merge_flex_able_with_concrete(
+                env,
+                ctx,
+                ctx.second,
+                *abilities,
+                RangedNumber(range_vars),
+                Obligated::Adhoc(ctx.first),
+            )
+        }
+        RecursionVar { .. } | Alias(..) | Structure(..) | RigidAbleVar(..) => {
             check_and_merge_valid_range(env, pool, ctx, ctx.first, range_vars, ctx.second)
         }
         &RangedNumber(other_range_vars) => match range_vars.intersection(&other_range_vars) {

crates/reporting/tests/test_reporting.rs

@@ -12572,4 +12572,30 @@ I recommend using camelCase. It's the standard style in Roc code!
     `crash` must be given exacly one message to crash with.
     "###
     );
+
+    test_no_problem!(
+        resolve_eq_for_unbound_num,
+        indoc!(
+            r#"
+            app "test" provides [main] to "./platform"
+
+            n : Num *
+
+            main = n == 1
+            "#
+        )
+    );
+
+    test_no_problem!(
+        resolve_hash_for_unbound_num,
+        indoc!(
+            r#"
+            app "test" provides [main] to "./platform"
+
+            n : Num *
+
+            main = \hasher -> Hash.hash hasher n
+            "#
+        )
+    );
 }