Imported Upstream version 1.0.2upstream/1.0.2

1 files changed, 5 insertions, 2 deletions

diff --git a/src/pkg/regexp/syntax/parse.go b/src/pkg/regexp/syntax/parse.go
index 2df775025..4924e9453 100644
--- a/src/pkg/regexp/syntax/parse.go
+++ b/src/pkg/regexp/syntax/parse.go
@@ -48,6 +48,9 @@ const (
 	ErrTrailingBackslash     ErrorCode = "trailing backslash at end of expression"
 )
 
+// TODO: Export for Go 1.1.
+const errUnexpectedParen ErrorCode = "unexpected )"
+
 func (e ErrorCode) String() string {
 	return string(e)
 }
@@ -1168,13 +1171,13 @@ func (p *parser) parseRightParen() error {
 
 	n := len(p.stack)
 	if n < 2 {
-		return &Error{ErrInternalError, ""}
+		return &Error{errUnexpectedParen, p.wholeRegexp}
 	}
 	re1 := p.stack[n-1]
 	re2 := p.stack[n-2]
 	p.stack = p.stack[:n-2]
 	if re2.Op != opLeftParen {
-		return &Error{ErrMissingParen, p.wholeRegexp}
+		return &Error{errUnexpectedParen, p.wholeRegexp}
 	}
 	// Restore flags at time of paren.
 	p.flags = re2.Flags