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go/parser: first constant in a constant declaration must have a value

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R=r, rsc1
CC=golang-dev
https://golang.org/cl/4291042
This commit is contained in:
Robert Griesemer 2011-03-11 14:33:31 -08:00
parent ec713d68b8
commit 7664ec39b8
2 changed files with 10 additions and 9 deletions
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18
src/pkg/go/parser/parser.go
View File

@ -1864,10 +1864,10 @@ func (p *parser) parseStmt() (s ast.Stmt) {
// ----------------------------------------------------------------------------
// Declarations
type parseSpecFunction func(p *parser, doc *ast.CommentGroup) ast.Spec
type parseSpecFunction func(p *parser, doc *ast.CommentGroup, iota int) ast.Spec
func parseImportSpec(p *parser, doc *ast.CommentGroup) ast.Spec {
func parseImportSpec(p *parser, doc *ast.CommentGroup, _ int) ast.Spec {
if p.trace {
defer un(trace(p, "ImportSpec"))
}
@ -1894,7 +1894,7 @@ func parseImportSpec(p *parser, doc *ast.CommentGroup) ast.Spec {
}
func parseConstSpec(p *parser, doc *ast.CommentGroup) ast.Spec {
func parseConstSpec(p *parser, doc *ast.CommentGroup, iota int) ast.Spec {
if p.trace {
defer un(trace(p, "ConstSpec"))
}
@ -1902,7 +1902,7 @@ func parseConstSpec(p *parser, doc *ast.CommentGroup) ast.Spec {
idents := p.parseIdentList()
typ := p.tryType()
var values []ast.Expr
if typ != nil || p.tok == token.ASSIGN {
if typ != nil || p.tok == token.ASSIGN || iota == 0 {
p.expect(token.ASSIGN)
values = p.parseExprList()
}
@ -1919,7 +1919,7 @@ func parseConstSpec(p *parser, doc *ast.CommentGroup) ast.Spec {
}
func parseTypeSpec(p *parser, doc *ast.CommentGroup) ast.Spec {
func parseTypeSpec(p *parser, doc *ast.CommentGroup, _ int) ast.Spec {
if p.trace {
defer un(trace(p, "TypeSpec"))
}
@ -1939,7 +1939,7 @@ func parseTypeSpec(p *parser, doc *ast.CommentGroup) ast.Spec {
}
func parseVarSpec(p *parser, doc *ast.CommentGroup) ast.Spec {
func parseVarSpec(p *parser, doc *ast.CommentGroup, _ int) ast.Spec {
if p.trace {
defer un(trace(p, "VarSpec"))
}
@ -1976,13 +1976,13 @@ func (p *parser) parseGenDecl(keyword token.Token, f parseSpecFunction) *ast.Gen
if p.tok == token.LPAREN {
lparen = p.pos
p.next()
for p.tok != token.RPAREN && p.tok != token.EOF {
list = append(list, f(p, p.leadComment))
for iota := 0; p.tok != token.RPAREN && p.tok != token.EOF; iota++ {
list = append(list, f(p, p.leadComment, iota))
}
rparen = p.expect(token.RPAREN)
p.expectSemi()
} else {
list = append(list, f(p, nil))
list = append(list, f(p, nil, 0))
}
return &ast.GenDecl{doc, pos, keyword, lparen, list, rparen}

1
src/pkg/go/parser/parser_test.go
View File

@ -21,6 +21,7 @@ var illegalInputs = []interface{}{
`package p; func f() { if /* should have condition */ {} };`,
`package p; func f() { if ; /* should have condition */ {} };`,
`package p; func f() { if f(); /* should have condition */ {} };`,
`package p; const c; /* should have constant value */`,
}