go/types: add defined type to term/termlist tests

This is a port of CL 339905 to go/types.

Change-Id: I9afac9e84bde6f34bb65c7e3d726986d2c648a91
Reviewed-on: https://go-review.googlesource.com/c/go/+/342436
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

src/go/types/termlist_test.go

@@ -32,9 +32,11 @@ func TestTermlistString(t *testing.T) {
 		"𝓤",
 		"int",
 		"~int",
+		"myInt",
 		"∅ ∪ ∅",
 		"𝓤 ∪ 𝓤",
 		"∅ ∪ 𝓤 ∪ int",
+		"∅ ∪ 𝓤 ∪ int ∪ myInt",
 	} {
 		if got := maketl(want).String(); got != want {
 			t.Errorf("(%v).String() == %v", want, got)
@@ -44,11 +46,13 @@ func TestTermlistString(t *testing.T) {
 
 func TestTermlistIsEmpty(t *testing.T) {
 	for test, want := range map[string]bool{
-		"∅":         true,
+		"∅":             true,
-		"∅ ∪ ∅":     true,
+		"∅ ∪ ∅":         true,
-		"∅ ∪ ∅ ∪ 𝓤": false,
+		"∅ ∪ ∅ ∪ 𝓤":     false,
-		"𝓤":         false,
+		"∅ ∪ ∅ ∪ myInt": false,
-		"𝓤 ∪ int":   false,
+		"𝓤":             false,
+		"𝓤 ∪ int":       false,
+		"𝓤 ∪ myInt ∪ ∅": false,
 	} {
 		xl := maketl(test)
 		got := xl.isEmpty()
@@ -63,9 +67,11 @@ func TestTermlistIsAll(t *testing.T) {
 		"∅":             false,
 		"∅ ∪ ∅":         false,
 		"int ∪ ~string": false,
+		"~int ∪ myInt":  false,
 		"∅ ∪ ∅ ∪ 𝓤":     true,
 		"𝓤":             true,
 		"𝓤 ∪ int":       true,
+		"myInt ∪ 𝓤":     true,
 	} {
 		xl := maketl(test)
 		got := xl.isAll()
@@ -82,10 +88,15 @@ func TestTermlistNorm(t *testing.T) {
 		{"∅", "∅"},
 		{"∅ ∪ ∅", "∅"},
 		{"∅ ∪ int", "int"},
+		{"∅ ∪ myInt", "myInt"},
 		{"𝓤 ∪ int", "𝓤"},
+		{"𝓤 ∪ myInt", "𝓤"},
+		{"int ∪ myInt", "int ∪ myInt"},
 		{"~int ∪ int", "~int"},
+		{"~int ∪ myInt", "~int"},
 		{"int ∪ ~string ∪ int", "int ∪ ~string"},
 		{"~int ∪ string ∪ 𝓤 ∪ ~string ∪ int", "𝓤"},
+		{"~int ∪ string ∪ myInt ∪ ~string ∪ int", "~int ∪ ~string"},
 	} {
 		xl := maketl(test.xl)
 		got := maketl(test.xl).norm()
@@ -108,8 +119,10 @@ func TestTermlistStructuralType(t *testing.T) {
 		"∅":                 "nil",
 		"𝓤":                 "nil",
 		"int":               "int",
+		"myInt":             "myInt",
 		"~int":              "int",
 		"~int ∪ string":     "nil",
+		"~int ∪ myInt":      "int",
 		"∅ ∪ int":           "int",
 		"∅ ∪ ~int":          "int",
 		"∅ ∪ ~int ∪ string": "nil",
@@ -133,10 +146,14 @@ func TestTermlistUnion(t *testing.T) {
 		{"𝓤", "~int", "𝓤"},
 		{"int", "~int", "~int"},
 		{"int", "string", "int ∪ string"},
+		{"int", "myInt", "int ∪ myInt"},
+		{"~int", "myInt", "~int"},
 		{"int ∪ string", "~string", "int ∪ ~string"},
 		{"~int ∪ string", "~string ∪ int", "~int ∪ ~string"},
 		{"~int ∪ string ∪ ∅", "~string ∪ int", "~int ∪ ~string"},
+		{"~int ∪ myInt ∪ ∅", "~string ∪ int", "~int ∪ ~string"},
 		{"~int ∪ string ∪ 𝓤", "~string ∪ int", "𝓤"},
+		{"~int ∪ string ∪ myInt", "~string ∪ int", "~int ∪ ~string"},
 	} {
 		xl := maketl(test.xl)
 		yl := maketl(test.yl)
@@ -155,13 +172,19 @@ func TestTermlistIntersect(t *testing.T) {
 		{"∅", "∅", "∅"},
 		{"∅", "𝓤", "∅"},
 		{"∅", "int", "∅"},
+		{"∅", "myInt", "∅"},
 		{"𝓤", "~int", "~int"},
+		{"𝓤", "myInt", "myInt"},
 		{"int", "~int", "int"},
 		{"int", "string", "∅"},
+		{"int", "myInt", "∅"},
+		{"~int", "myInt", "myInt"},
 		{"int ∪ string", "~string", "string"},
 		{"~int ∪ string", "~string ∪ int", "int ∪ string"},
 		{"~int ∪ string ∪ ∅", "~string ∪ int", "int ∪ string"},
+		{"~int ∪ myInt ∪ ∅", "~string ∪ int", "int"},
 		{"~int ∪ string ∪ 𝓤", "~string ∪ int", "int ∪ ~string"},
+		{"~int ∪ string ∪ myInt", "~string ∪ int", "int ∪ string"},
 	} {
 		xl := maketl(test.xl)
 		yl := maketl(test.yl)
@@ -182,7 +205,9 @@ func TestTermlistEqual(t *testing.T) {
 		{"𝓤", "𝓤", true},
 		{"𝓤 ∪ int", "𝓤", true},
 		{"𝓤 ∪ int", "string ∪ 𝓤", true},
+		{"𝓤 ∪ myInt", "string ∪ 𝓤", true},
 		{"int ∪ ~string", "string ∪ int", false},
+		{"~int ∪ string", "string ∪ myInt", false},
 		{"int ∪ ~string ∪ ∅", "string ∪ int ∪ ~string", true},
 	} {
 		xl := maketl(test.xl)
@@ -204,10 +229,12 @@ func TestTermlistIncludes(t *testing.T) {
 		{"~int", "int", true},
 		{"int", "string", false},
 		{"~int", "string", false},
+		{"~int", "myInt", true},
 		{"int ∪ string", "string", true},
 		{"~int ∪ string", "int", true},
-		{"~int ∪ string ∪ ∅", "string", true},
+		{"~int ∪ string", "myInt", true},
-		{"~string ∪ ∅ ∪ 𝓤", "int", true},
+		{"~int ∪ myInt ∪ ∅", "myInt", true},
+		{"myInt ∪ ∅ ∪ 𝓤", "int", true},
 	} {
 		xl := maketl(test.xl)
 		yl := testTerm(test.typ).typ
@@ -230,16 +257,20 @@ func TestTermlistSupersetOf(t *testing.T) {
 		{"𝓤", "𝓤", true},
 		{"𝓤", "int", true},
 		{"𝓤", "~int", true},
+		{"𝓤", "myInt", true},
 		{"~int", "int", true},
 		{"~int", "~int", true},
+		{"~int", "myInt", true},
 		{"int", "~int", false},
+		{"myInt", "~int", false},
 		{"int", "string", false},
 		{"~int", "string", false},
 		{"int ∪ string", "string", true},
 		{"int ∪ string", "~string", false},
 		{"~int ∪ string", "int", true},
+		{"~int ∪ string", "myInt", true},
 		{"~int ∪ string ∪ ∅", "string", true},
-		{"~string ∪ ∅ ∪ 𝓤", "int", true},
+		{"~string ∪ ∅ ∪ 𝓤", "myInt", true},
 	} {
 		xl := maketl(test.xl)
 		y := testTerm(test.typ)
@@ -261,12 +292,16 @@ func TestTermlistSubsetOf(t *testing.T) {
 		{"𝓤", "𝓤", true},
 		{"int", "int ∪ string", true},
 		{"~int", "int ∪ string", false},
+		{"~int", "myInt ∪ string", false},
+		{"myInt", "~int ∪ string", true},
 		{"~int", "string ∪ string ∪ int ∪ ~int", true},
+		{"myInt", "string ∪ string ∪ ~int", true},
 		{"int ∪ string", "string", false},
 		{"int ∪ string", "string ∪ int", true},
 		{"int ∪ ~string", "string ∪ int", false},
-		{"int ∪ ~string", "string ∪ int ∪ 𝓤", true},
+		{"myInt ∪ ~string", "string ∪ int ∪ 𝓤", true},
 		{"int ∪ ~string", "string ∪ int ∪ ∅ ∪ string", false},
+		{"int ∪ myInt", "string ∪ ~int ∪ ∅ ∪ string", true},
 	} {
 		xl := maketl(test.xl)
 		yl := maketl(test.yl)

src/go/types/typeterm.go

@@ -151,6 +151,9 @@ func (x *term) subsetOf(y *term) bool {
 // disjoint reports whether x ∩ y == ∅.
 // x.typ and y.typ must not be nil.
 func (x *term) disjoint(y *term) bool {
+	if debug && (x.typ == nil || y.typ == nil) {
+		panic("invalid argument(s)")
+	}
 	ux := x.typ
 	if y.tilde {
 		ux = under(ux)

src/go/types/typeterm_test.go

@@ -5,10 +5,16 @@
 package types
 
 import (
+	"go/token"
 	"strings"
 	"testing"
 )
 
+var myInt = func() Type {
+	tname := NewTypeName(token.NoPos, nil, "myInt", nil)
+	return NewNamed(tname, Typ[Int], nil)
+}()
+
 var testTerms = map[string]*term{
 	"∅":       nil,
 	"𝓤":       {},
@@ -16,7 +22,7 @@ var testTerms = map[string]*term{
 	"~int":    {true, Typ[Int]},
 	"string":  {false, Typ[String]},
 	"~string": {true, Typ[String]},
-	// TODO(gri) add a defined type
+	"myInt":   {false, myInt},
 }
 
 func TestTermString(t *testing.T) {
@@ -49,12 +55,16 @@ func TestTermEqual(t *testing.T) {
 		"𝓤 𝓤 T",
 		"int int T",
 		"~int ~int T",
+		"myInt myInt T",
 		"∅ 𝓤 F",
 		"∅ int F",
 		"∅ ~int F",
 		"𝓤 int F",
 		"𝓤 ~int F",
+		"𝓤 myInt F",
 		"int ~int F",
+		"int myInt F",
+		"~int myInt F",
 	} {
 		args := split(test, 3)
 		x := testTerm(args[0])
@@ -77,25 +87,33 @@ func TestTermUnion(t *testing.T) {
 		"∅ 𝓤 𝓤 ∅",
 		"∅ int int ∅",
 		"∅ ~int ~int ∅",
+		"∅ myInt myInt ∅",
 		"𝓤 𝓤 𝓤 ∅",
 		"𝓤 int 𝓤 ∅",
 		"𝓤 ~int 𝓤 ∅",
+		"𝓤 myInt 𝓤 ∅",
 		"int int int ∅",
 		"int ~int ~int ∅",
 		"int string int string",
 		"int ~string int ~string",
+		"int myInt int myInt",
 		"~int ~string ~int ~string",
+		"~int myInt ~int ∅",
 
 		// union is symmetric, but the result order isn't - repeat symmetric cases explictly
 		"𝓤 ∅ 𝓤 ∅",
 		"int ∅ int ∅",
 		"~int ∅ ~int ∅",
+		"myInt ∅ myInt ∅",
 		"int 𝓤 𝓤 ∅",
 		"~int 𝓤 𝓤 ∅",
+		"myInt 𝓤 𝓤 ∅",
 		"~int int ~int ∅",
 		"string int string int",
 		"~string int ~string int",
+		"myInt int myInt int",
 		"~string ~int ~string ~int",
+		"myInt ~int ~int ∅",
 	} {
 		args := split(test, 4)
 		x := testTerm(args[0])
@@ -114,14 +132,18 @@ func TestTermIntersection(t *testing.T) {
 		"∅ 𝓤 ∅",
 		"∅ int ∅",
 		"∅ ~int ∅",
+		"∅ myInt ∅",
 		"𝓤 𝓤 𝓤",
 		"𝓤 int int",
 		"𝓤 ~int ~int",
+		"𝓤 myInt myInt",
 		"int int int",
 		"int ~int int",
 		"int string ∅",
 		"int ~string ∅",
+		"int string ∅",
 		"~int ~string ∅",
+		"~int myInt myInt",
 	} {
 		args := split(test, 3)
 		x := testTerm(args[0])
@@ -144,8 +166,10 @@ func TestTermIncludes(t *testing.T) {
 		"𝓤 int T",
 		"int int T",
 		"~int int T",
+		"~int myInt T",
 		"string int F",
 		"~string int F",
+		"myInt int F",
 	} {
 		args := split(test, 3)
 		x := testTerm(args[0])
@@ -163,12 +187,19 @@ func TestTermSubsetOf(t *testing.T) {
 		"𝓤 𝓤 T",
 		"int int T",
 		"~int ~int T",
+		"myInt myInt T",
 		"∅ 𝓤 T",
 		"∅ int T",
 		"∅ ~int T",
+		"∅ myInt T",
 		"𝓤 int F",
 		"𝓤 ~int F",
+		"𝓤 myInt F",
 		"int ~int T",
+		"int myInt F",
+		"~int myInt F",
+		"myInt int F",
+		"myInt ~int T",
 	} {
 		args := split(test, 3)
 		x := testTerm(args[0])
@@ -187,7 +218,11 @@ func TestTermDisjoint(t *testing.T) {
 		"int ~int F",
 		"int string T",
 		"int ~string T",
+		"int myInt T",
 		"~int ~string T",
+		"~int myInt F",
+		"string myInt T",
+		"~string myInt T",
 	} {
 		args := split(test, 3)
 		x := testTerm(args[0])