gofmt: more consistent formatting of const/var decls

- gofmt -w src misc
- only manually modified file: src/pkg/go/printer/nodes.go

R=rsc
CC=golang-dev, r
https://golang.org/cl/606041

src/pkg/go/printer/nodes.go

@@ -1105,11 +1105,6 @@ const (
 // multiLine to true if the spec spans multiple lines.
 //
 func (p *printer) spec(spec ast.Spec, n int, context declContext, indent bool, multiLine *bool) {
-	var (
-		comment   *ast.CommentGroup // a line comment, if any
-		extraTabs int               // number of extra tabs before comment, if any
-	)
-
 	switch s := spec.(type) {
 	case *ast.ImportSpec:
 		p.setComment(s.Doc)
@@ -1118,7 +1113,7 @@ func (p *printer) spec(spec ast.Spec, n int, context declContext, indent bool, m
 			p.print(blank)
 		}
 		p.expr(s.Path, multiLine)
-		comment = s.Comment
+		p.setComment(s.Comment)
 
 	case *ast.ValueSpec:
 		p.setComment(s.Doc)
@@ -1132,23 +1127,27 @@ func (p *printer) spec(spec ast.Spec, n int, context declContext, indent bool, m
 				p.print(blank, token.ASSIGN)
 				p.exprList(noPos, s.Values, 1, blankStart|commaSep, multiLine, noPos)
 			}
+			p.setComment(s.Comment)
+
 		} else {
-			extraTabs = 2
-			if s.Type != nil || s.Values != nil {
-				p.print(vtab)
-			}
+			extraTabs := 3
 			if s.Type != nil {
+				p.print(vtab)
 				p.expr(s.Type, multiLine)
-				extraTabs = 1
+				extraTabs--
 			}
 			if s.Values != nil {
-				p.print(vtab)
-				p.print(token.ASSIGN)
+				p.print(vtab, token.ASSIGN)
 				p.exprList(noPos, s.Values, 1, blankStart|commaSep, multiLine, noPos)
-				extraTabs = 0
+				extraTabs--
+			}
+			if s.Comment != nil {
+				for ; extraTabs > 0; extraTabs-- {
+					p.print(vtab)
+				}
+				p.setComment(s.Comment)
 			}
 		}
-		comment = s.Comment
 
 	case *ast.TypeSpec:
 		p.setComment(s.Doc)
@@ -1159,18 +1158,11 @@ func (p *printer) spec(spec ast.Spec, n int, context declContext, indent bool, m
 			p.print(vtab)
 		}
 		p.expr(s.Type, multiLine)
-		comment = s.Comment
+		p.setComment(s.Comment)
 
 	default:
 		panic("unreachable")
 	}
-
-	if comment != nil {
-		for ; extraTabs > 0; extraTabs-- {
-			p.print(vtab)
-		}
-		p.setComment(comment)
-	}
 }
 
 

src/pkg/go/printer/testdata/comments.golden

@@ -14,6 +14,35 @@ const (
 	c2		// c2
 )
 
+// Alignment of comments in declarations>
+const (
+	_	T	= iota	// comment
+	_			// comment
+	_			// comment
+	_	= iota + 10
+	_	// comments
+
+	_	= 10		// comment
+	_	T	= 20	// comment
+)
+
+const (
+	_____	= iota	// foo
+	_		// bar
+	_	= 0	// bal
+	_		// bat
+)
+
+const (
+	_	T	= iota	// comment
+	_			// comment
+	_			// comment
+	_	= iota + 10
+	_	// comment
+	_	= 10
+	_	= 20		// comment
+	_	T	= 0	// comment
+)
 
 // The SZ struct; it is empty.
 type SZ struct{}

src/pkg/go/printer/testdata/comments.input

@@ -14,6 +14,35 @@ const (
 	c2  // c2
 )
 
+// Alignment of comments in declarations>
+const (
+	_ T = iota  // comment
+	_  // comment
+	_  // comment
+	_ = iota+10
+	_  // comments
+
+	_ = 10  // comment
+	_ T = 20  // comment
+)
+
+const (
+	_____ = iota // foo
+	_ // bar
+	_  = 0    // bal
+	_ // bat
+)
+
+const (
+	_ T = iota // comment
+	_ // comment
+	_ // comment
+	_ = iota + 10
+	_ // comment
+	_ = 10
+	_ = 20 // comment
+	_ T = 0 // comment
+)
 
 // The SZ struct; it is empty.
 type SZ struct {}