core: Fixed variables not being in scope for destroy -target on modules

terraform/context_apply_test.go

@@ -3119,6 +3119,68 @@ module.child:
 	}
 }
 
+func TestContext2Apply_destroyTargetWithModuleVariableAndCount(t *testing.T) {
+	m := testModule(t, "apply-destroy-mod-var-and-count")
+	p := testProvider("aws")
+	p.ApplyFn = testApplyFn
+	p.DiffFn = testDiffFn
+
+	var state *State
+	var err error
+	{
+		ctx := testContext2(t, &ContextOpts{
+			Module: m,
+			Providers: map[string]ResourceProviderFactory{
+				"aws": testProviderFuncFixed(p),
+			},
+		})
+
+		// First plan and apply a create operation
+		if _, err := ctx.Plan(); err != nil {
+			t.Fatalf("plan err: %s", err)
+		}
+
+		state, err = ctx.Apply()
+		if err != nil {
+			t.Fatalf("apply err: %s", err)
+		}
+	}
+
+	{
+		ctx := testContext2(t, &ContextOpts{
+			Destroy: true,
+			Module:  m,
+			State:   state,
+			Providers: map[string]ResourceProviderFactory{
+				"aws": testProviderFuncFixed(p),
+			},
+			Targets: []string{"module.child"},
+		})
+
+		_, err := ctx.Plan()
+		if err != nil {
+			t.Fatalf("plan err: %s", err)
+		}
+
+		// Destroy, targeting the module explicitly
+		state, err = ctx.Apply()
+		if err != nil {
+			t.Fatalf("destroy apply err: %s", err)
+		}
+	}
+
+	//Test that things were destroyed
+	actual := strings.TrimSpace(state.String())
+	expected := strings.TrimSpace(`
+<no state>
+module.child:
+  <no state>
+		`)
+	if actual != expected {
+		t.Fatalf("expected: \n%s\n\nbad: \n%s", expected, actual)
+	}
+}
+
 func TestContext2Apply_destroyWithModuleVariableAndCountNested(t *testing.T) {
 	m := testModule(t, "apply-destroy-mod-var-and-count-nested")
 	p := testProvider("aws")

terraform/transform_targets.go

@@ -86,6 +86,15 @@ func (t *TargetsTransformer) selectTargetedNodes(
 			var err error
 			if t.Destroy {
 				deps, err = g.Descendents(v)
+
+				// Select any variables that we depend on in case we need them later for
+				// interpolating in the count
+				ancestors, _ := g.Ancestors(v)
+				for _, a := range ancestors.List() {
+					if _, ok := a.(*GraphNodeConfigVariableFlat); ok {
+						deps.Add(a)
+					}
+				}
 			} else {
 				deps, err = g.Ancestors(v)
 			}