parse resource refs correctly

Now that we only evaluate whole resources, we can parse resource refs
correct as the resource, rather than an unknown instance.

addrs/parse_ref.go

@@ -290,7 +290,7 @@ func parseResourceRef(mode ResourceMode, startRange hcl.Range, traversal hcl.Tra
 		// of the resource, but we don't have enough context here to decide
 		// so we'll let the caller resolve that ambiguity.
 		return &Reference{
-			Subject:     resourceInstAddr,
+			Subject:     resourceAddr,
 			SourceRange: tfdiags.SourceRangeFromHCL(rng),
 		}, diags
 	}

addrs/parse_ref_test.go

@@ -114,12 +114,10 @@ func TestParseRef(t *testing.T) {
 		{
 			`data.external.foo`,
 			&Reference{
-				Subject: ResourceInstance{
-					Resource: Resource{
-						Mode: DataResourceMode,
-						Type: "external",
-						Name: "foo",
-					},
+				Subject: Resource{
+					Mode: DataResourceMode,
+					Type: "external",
+					Name: "foo",
 				},
 				SourceRange: tfdiags.SourceRange{
 					Start: tfdiags.SourcePos{Line: 1, Column: 1, Byte: 0},
@@ -592,12 +590,10 @@ func TestParseRef(t *testing.T) {
 		{
 			`boop_instance.foo`,
 			&Reference{
-				Subject: ResourceInstance{
-					Resource: Resource{
-						Mode: ManagedResourceMode,
-						Type: "boop_instance",
-						Name: "foo",
-					},
+				Subject: Resource{
+					Mode: ManagedResourceMode,
+					Type: "boop_instance",
+					Name: "foo",
 				},
 				SourceRange: tfdiags.SourceRange{
 					Start: tfdiags.SourcePos{Line: 1, Column: 1, Byte: 0},

lang/eval.go

@@ -261,8 +261,6 @@ func (s *Scope) evalContext(refs []*addrs.Reference, selfAddr addrs.Referenceabl
 		// in package addrs.
 		switch subj := rawSubj.(type) {
 		case addrs.Resource:
-			panic("RESOURCE REFERENCES DON'T HIT THIS")
-
 			var into map[string]map[string]cty.Value
 			switch subj.Mode {
 			case addrs.ManagedResourceMode: