go.tools/go/types: consistently use 'elem' instead of 'elt'

This is simply a rename of unexported struct fields.
No other changes.

R=adonovan
CC=golang-dev
https://golang.org/cl/17330043

go/types/builtins.go

@@ -69,7 +69,7 @@ func (check *checker) builtin(x *operand, call *ast.CallExpr, id builtinId) (_ b
 		S := x.typ
 		var T Type
 		if s, _ := S.Underlying().(*Slice); s != nil {
-			T = s.elt
+			T = s.elem
 		} else {
 			check.invalidArg(x.pos(), "%s is not a slice", x)
 			return
@@ -262,7 +262,7 @@ func (check *checker) builtin(x *operand, call *ast.CallExpr, id builtinId) (_ b
 		// copy(x, y []T) int
 		var dst Type
 		if t, _ := x.typ.Underlying().(*Slice); t != nil {
-			dst = t.elt
+			dst = t.elem
 		}
 
 		var y operand
@@ -277,7 +277,7 @@ func (check *checker) builtin(x *operand, call *ast.CallExpr, id builtinId) (_ b
 				src = Typ[Byte]
 			}
 		case *Slice:
-			src = t.elt
+			src = t.elem
 		}
 
 		if dst == nil || src == nil {

go/types/call.go

@@ -237,7 +237,7 @@ func (check *checker) argument(sig *Signature, i int, x *operand, passSlice bool
 		}
 	} else if sig.isVariadic && i >= n-1 {
 		// use the variadic parameter slice's element type
-		typ = typ.(*Slice).elt
+		typ = typ.(*Slice).elem
 	}
 
 	if !check.assignment(x, typ) && x.mode != invalid {

go/types/conversions.go

@@ -135,7 +135,7 @@ func isPointer(typ Type) bool {
 
 func isBytesOrRunes(typ Type) bool {
 	if s, ok := typ.(*Slice); ok {
-		t, ok := s.elt.Underlying().(*Basic)
+		t, ok := s.elem.Underlying().(*Basic)
 		return ok && (t.kind == Byte || t.kind == Rune)
 	}
 	return false

go/types/errors.go

@@ -193,7 +193,7 @@ func writeTuple(buf *bytes.Buffer, tup *Tuple, isVariadic bool) {
 			typ := v.typ
 			if isVariadic && i == len(tup.vars)-1 {
 				buf.WriteString("...")
-				typ = typ.(*Slice).elt
+				typ = typ.(*Slice).elem
 			}
 			writeType(buf, typ)
 		}
@@ -231,11 +231,11 @@ func writeType(buf *bytes.Buffer, typ Type) {
 
 	case *Array:
 		fmt.Fprintf(buf, "[%d]", t.len)
-		writeType(buf, t.elt)
+		writeType(buf, t.elem)
 
 	case *Slice:
 		buf.WriteString("[]")
-		writeType(buf, t.elt)
+		writeType(buf, t.elem)
 
 	case *Struct:
 		buf.WriteString("struct{")
@@ -300,7 +300,7 @@ func writeType(buf *bytes.Buffer, typ Type) {
 		buf.WriteString("map[")
 		writeType(buf, t.key)
 		buf.WriteByte(']')
-		writeType(buf, t.elt)
+		writeType(buf, t.elem)
 
 	case *Chan:
 		var s string
@@ -313,7 +313,7 @@ func writeType(buf *bytes.Buffer, typ Type) {
 			s = "chan "
 		}
 		buf.WriteString(s)
-		writeType(buf, t.elt)
+		writeType(buf, t.elem)
 
 	case *Named:
 		s := "<Named w/o object>"

go/types/expr.go

@@ -108,7 +108,7 @@ func (check *checker) unary(x *operand, op token.Token) {
 			return
 		}
 		x.mode = commaok
-		x.typ = typ.elt
+		x.typ = typ.elem
 		return
 	}
 
@@ -987,7 +987,7 @@ func (check *checker) exprInternal(x *operand, e ast.Expr, hint Type) exprKind {
 					// We have an "open" [...]T array type.
 					// Create a new ArrayType with unknown length (-1)
 					// and finish setting it up after analyzing the literal.
-					typ = &Array{len: -1, elt: check.typ(atyp.Elt, nil, false)}
+					typ = &Array{len: -1, elem: check.typ(atyp.Elt, nil, false)}
 					openArray = true
 				}
 			}
@@ -1070,14 +1070,14 @@ func (check *checker) exprInternal(x *operand, e ast.Expr, hint Type) exprKind {
 			}
 
 		case *Array:
-			n := check.indexedElts(e.Elts, utyp.elt, utyp.len)
+			n := check.indexedElts(e.Elts, utyp.elem, utyp.len)
 			// if we have an "open" [...]T array, set the length now that we know it
 			if openArray {
 				utyp.len = n
 			}
 
 		case *Slice:
-			check.indexedElts(e.Elts, utyp.elt, -1)
+			check.indexedElts(e.Elts, utyp.elem, -1)
 
 		case *Map:
 			visited := make(map[interface{}]bool, len(e.Elts))
@@ -1101,10 +1101,10 @@ func (check *checker) exprInternal(x *operand, e ast.Expr, hint Type) exprKind {
 					}
 					visited[x.val] = true
 				}
-				check.exprWithHint(x, kv.Value, utyp.elt)
+				check.exprWithHint(x, kv.Value, utyp.elem)
-				if !check.assignment(x, utyp.elt) {
+				if !check.assignment(x, utyp.elem) {
 					if x.mode != invalid {
-						check.errorf(x.pos(), "cannot use %s as %s value in map literal", x, utyp.elt)
+						check.errorf(x.pos(), "cannot use %s as %s value in map literal", x, utyp.elem)
 					}
 					continue
 				}
@@ -1154,20 +1154,20 @@ func (check *checker) exprInternal(x *operand, e ast.Expr, hint Type) exprKind {
 			if x.mode != variable {
 				x.mode = value
 			}
-			x.typ = typ.elt
+			x.typ = typ.elem
 
 		case *Pointer:
 			if typ, _ := typ.base.Underlying().(*Array); typ != nil {
 				valid = true
 				length = typ.len
 				x.mode = variable
-				x.typ = typ.elt
+				x.typ = typ.elem
 			}
 
 		case *Slice:
 			valid = true
 			x.mode = variable
-			x.typ = typ.elt
+			x.typ = typ.elem
 
 		case *Map:
 			var key operand
@@ -1179,7 +1179,7 @@ func (check *checker) exprInternal(x *operand, e ast.Expr, hint Type) exprKind {
 				goto Error
 			}
 			x.mode = mapindex
-			x.typ = typ.elt
+			x.typ = typ.elem
 			x.expr = e
 			return expression
 		}
@@ -1231,14 +1231,14 @@ func (check *checker) exprInternal(x *operand, e ast.Expr, hint Type) exprKind {
 				check.invalidOp(x.pos(), "cannot slice %s (value not addressable)", x)
 				goto Error
 			}
-			x.typ = &Slice{elt: typ.elt}
+			x.typ = &Slice{elem: typ.elem}
 
 		case *Pointer:
 			if typ, _ := typ.base.Underlying().(*Array); typ != nil {
 				valid = true
 				length = typ.len
 				x.mode = variable
-				x.typ = &Slice{elt: typ.elt}
+				x.typ = &Slice{elem: typ.elem}
 			}
 
 		case *Slice:

go/types/gcimporter.go

@@ -415,12 +415,12 @@ func (p *gcParser) parseArrayType() Type {
 	// "[" already consumed and lookahead known not to be "]"
 	lit := p.expect(scanner.Int)
 	p.expect(']')
-	elt := p.parseType()
+	elem := p.parseType()
 	n, err := strconv.ParseInt(lit, 10, 64)
 	if err != nil {
 		p.error(err)
 	}
-	return &Array{len: n, elt: elt}
+	return &Array{len: n, elem: elem}
 }
 
 // MapType = "map" "[" Type "]" Type .
@@ -430,8 +430,8 @@ func (p *gcParser) parseMapType() Type {
 	p.expect('[')
 	key := p.parseType()
 	p.expect(']')
-	elt := p.parseType()
+	elem := p.parseType()
-	return &Map{key: key, elt: elt}
+	return &Map{key: key, elem: elem}
 }
 
 // Name = identifier | "?" | QualifiedName .
@@ -550,7 +550,7 @@ func (p *gcParser) parseParameter() (par *Var, isVariadic bool) {
 	}
 	typ := p.parseType()
 	if isVariadic {
-		typ = &Slice{elt: typ}
+		typ = &Slice{elem: typ}
 	}
 	// ignore argument tag (e.g. "noescape")
 	if p.tok == scanner.String {
@@ -657,8 +657,8 @@ func (p *gcParser) parseChanType() Type {
 		p.expectKeyword("chan")
 		dir = ast.RECV
 	}
-	elt := p.parseType()
+	elem := p.parseType()
-	return &Chan{dir: dir, elt: elt}
+	return &Chan{dir: dir, elem: elem}
 }
 
 // Type =
@@ -700,7 +700,7 @@ func (p *gcParser) parseType() Type {
 		if p.tok == ']' {
 			// SliceType
 			p.next()
-			return &Slice{elt: p.parseType()}
+			return &Slice{elem: p.parseType()}
 		}
 		return p.parseArrayType()
 	case '*':

go/types/operand.go

@@ -232,7 +232,7 @@ func (x *operand) isAssignableTo(conf *Config, T Type) bool {
 	// type, x's type V and T have identical element types,
 	// and at least one of V or T is not a named type
 	if Vc, ok := Vu.(*Chan); ok && Vc.dir == ast.SEND|ast.RECV {
-		if Tc, ok := Tu.(*Chan); ok && IsIdentical(Vc.elt, Tc.elt) {
+		if Tc, ok := Tu.(*Chan); ok && IsIdentical(Vc.elem, Tc.elem) {
 			return !isNamed(V) || !isNamed(T)
 		}
 	}

go/types/predicates.go

@@ -90,7 +90,7 @@ func isComparable(typ Type) bool {
 		}
 		return true
 	case *Array:
-		return isComparable(t.elt)
+		return isComparable(t.elem)
 	}
 	return false
 }
@@ -139,13 +139,13 @@ func isIdenticalInternal(x, y Type, p *ifacePair) bool {
 		// Two array types are identical if they have identical element types
 		// and the same array length.
 		if y, ok := y.(*Array); ok {
-			return x.len == y.len && isIdenticalInternal(x.elt, y.elt, p)
+			return x.len == y.len && isIdenticalInternal(x.elem, y.elem, p)
 		}
 
 	case *Slice:
 		// Two slice types are identical if they have identical element types.
 		if y, ok := y.(*Slice); ok {
-			return isIdenticalInternal(x.elt, y.elt, p)
+			return isIdenticalInternal(x.elem, y.elem, p)
 		}
 
 	case *Struct:
@@ -256,14 +256,14 @@ func isIdenticalInternal(x, y Type, p *ifacePair) bool {
 	case *Map:
 		// Two map types are identical if they have identical key and value types.
 		if y, ok := y.(*Map); ok {
-			return isIdenticalInternal(x.key, y.key, p) && isIdenticalInternal(x.elt, y.elt, p)
+			return isIdenticalInternal(x.key, y.key, p) && isIdenticalInternal(x.elem, y.elem, p)
 		}
 
 	case *Chan:
 		// Two channel types are identical if they have identical value types
 		// and the same direction.
 		if y, ok := y.(*Chan); ok {
-			return x.dir == y.dir && isIdenticalInternal(x.elt, y.elt, p)
+			return x.dir == y.dir && isIdenticalInternal(x.elem, y.elem, p)
 		}
 
 	case *Named:

go/types/sizes.go

@@ -46,7 +46,7 @@ func (s *StdSizes) Alignof(T Type) int64 {
 	case *Array:
 		// spec: "For a variable x of array type: unsafe.Alignof(x)
 		// is the same as unsafe.Alignof(x[0]), but at least 1."
-		return s.Alignof(t.elt)
+		return s.Alignof(t.elem)
 	case *Struct:
 		// spec: "For a variable x of struct type: unsafe.Alignof(x)
 		// is the largest of the values unsafe.Alignof(x.f) for each
@@ -92,8 +92,8 @@ func (s *StdSizes) Sizeof(T Type) int64 {
 			return s.WordSize * 2
 		}
 	case *Array:
-		a := s.Alignof(t.elt)
+		a := s.Alignof(t.elem)
-		z := s.Sizeof(t.elt)
+		z := s.Sizeof(t.elem)
 		return align(z, a) * t.len // may be 0
 	case *Slice:
 		return s.WordSize * 3

go/types/stmt.go

@@ -202,7 +202,7 @@ func (check *checker) stmt(ctxt stmtContext, s ast.Stmt) {
 		if ch.mode == invalid || x.mode == invalid {
 			return
 		}
-		if tch, ok := ch.typ.Underlying().(*Chan); !ok || tch.dir&ast.SEND == 0 || !check.assignment(&x, tch.elt) {
+		if tch, ok := ch.typ.Underlying().(*Chan); !ok || tch.dir&ast.SEND == 0 || !check.assignment(&x, tch.elem) {
 			if x.mode != invalid {
 				check.invalidOp(ch.pos(), "cannot send %s to channel %s", &x, &ch)
 			}
@@ -524,20 +524,20 @@ func (check *checker) stmt(ctxt stmtContext, s ast.Stmt) {
 			}
 		case *Array:
 			key = Typ[Int]
-			val = typ.elt
+			val = typ.elem
 		case *Slice:
 			key = Typ[Int]
-			val = typ.elt
+			val = typ.elem
 		case *Pointer:
 			if typ, _ := typ.base.Underlying().(*Array); typ != nil {
 				key = Typ[Int]
-				val = typ.elt
+				val = typ.elem
 			}
 		case *Map:
 			key = typ.key
-			val = typ.elt
+			val = typ.elem
 		case *Chan:
-			key = typ.elt
+			key = typ.elem
 			val = Typ[Invalid]
 			if typ.dir&ast.RECV == 0 {
 				check.errorf(x.pos(), "cannot range over send-only channel %s", &x)

go/types/types.go

@@ -101,8 +101,8 @@ func (b *Basic) Name() string { return b.name }
 
 // An Array represents an array type.
 type Array struct {
-	len int64
+	len  int64
-	elt Type
+	elem Type
 }
 
 // NewArray returns a new array type for the given element type and length.
@@ -112,18 +112,18 @@ func NewArray(elem Type, len int64) *Array { return &Array{len, elem} }
 func (a *Array) Len() int64 { return a.len }
 
 // Elem returns element type of array a.
-func (a *Array) Elem() Type { return a.elt }
+func (a *Array) Elem() Type { return a.elem }
 
 // A Slice represents a slice type.
 type Slice struct {
-	elt Type
+	elem Type
 }
 
 // NewSlice returns a new slice type for the given element type.
 func NewSlice(elem Type) *Slice { return &Slice{elem} }
 
 // Elem returns the element type of slice s.
-func (s *Slice) Elem() Type { return s.elt }
+func (s *Slice) Elem() Type { return s.elem }
 
 // A Struct represents a struct type.
 type Struct struct {
@@ -263,7 +263,7 @@ func (t *Interface) Method(i int) *Func { return t.allMethods[i] }
 
 // A Map represents a map type.
 type Map struct {
-	key, elt Type
+	key, elem Type
 }
 
 // NewMap returns a new map for the given key and element types.
@@ -275,12 +275,12 @@ func NewMap(key, elem Type) *Map {
 func (m *Map) Key() Type { return m.key }
 
 // Elem returns the element type of map m.
-func (m *Map) Elem() Type { return m.elt }
+func (m *Map) Elem() Type { return m.elem }
 
 // A Chan represents a channel type.
 type Chan struct {
-	dir ast.ChanDir
+	dir  ast.ChanDir
-	elt Type
+	elem Type
 }
 
 // NewChan returns a new channel type for the given direction and element type.
@@ -292,7 +292,7 @@ func NewChan(dir ast.ChanDir, elem Type) *Chan {
 func (c *Chan) Dir() ast.ChanDir { return c.dir }
 
 // Elem returns the element type of channel c.
-func (c *Chan) Elem() Type { return c.elt }
+func (c *Chan) Elem() Type { return c.elem }
 
 // A Named represents a named type.
 type Named struct {

go/types/typexpr.go

@@ -265,7 +265,7 @@ func (check *checker) typInternal(e ast.Expr, def *Named, cycleOk bool) Type {
 			}
 
 			typ.len = n
-			typ.elt = check.typ(e.Elt, nil, cycleOk)
+			typ.elem = check.typ(e.Elt, nil, cycleOk)
 			return typ
 
 		} else {
@@ -274,7 +274,7 @@ func (check *checker) typInternal(e ast.Expr, def *Named, cycleOk bool) Type {
 				def.underlying = typ
 			}
 
-			typ.elt = check.typ(e.Elt, nil, true)
+			typ.elem = check.typ(e.Elt, nil, true)
 			return typ
 		}
 
@@ -309,7 +309,7 @@ func (check *checker) typInternal(e ast.Expr, def *Named, cycleOk bool) Type {
 		}
 
 		typ.key = check.typ(e.Key, nil, true)
-		typ.elt = check.typ(e.Value, nil, true)
+		typ.elem = check.typ(e.Value, nil, true)
 
 		// spec: "The comparison operators == and != must be fully defined
 		// for operands of the key type; thus the key type must not be a
@@ -329,7 +329,7 @@ func (check *checker) typInternal(e ast.Expr, def *Named, cycleOk bool) Type {
 		}
 
 		typ.dir = e.Dir
-		typ.elt = check.typ(e.Value, nil, true)
+		typ.elem = check.typ(e.Value, nil, true)
 		return typ
 
 	default:
@@ -401,7 +401,7 @@ func (check *checker) collectParams(scope *Scope, list *ast.FieldList, variadicO
 	// For a variadic function, change the last parameter's type from T to []T.
 	if isVariadic && len(params) > 0 {
 		last := params[len(params)-1]
-		last.typ = &Slice{elt: last.typ}
+		last.typ = &Slice{elem: last.typ}
 	}
 
 	return