hcl/scanner: allow hyphens in idents

hcl/scanner/scanner.go

@@ -454,7 +454,7 @@ func (s *Scanner) scanDigits(ch rune, base, n int) rune {
 func (s *Scanner) scanIdentifier() string {
 	offs := s.srcPos.Offset - s.lastCharLen
 	ch := s.next()
-	for isLetter(ch) || isDigit(ch) {
+	for isLetter(ch) || isDigit(ch) || ch == '-' {
 		ch = s.next()
 	}
 

hcl/scanner/scanner_test.go

@@ -56,6 +56,7 @@ var tokenLists = map[string][]tokenPair{
 		{token.IDENT, "a"},
 		{token.IDENT, "a0"},
 		{token.IDENT, "foobar"},
+		{token.IDENT, "foo-bar"},
 		{token.IDENT, "abc123"},
 		{token.IDENT, "LGTM"},
 		{token.IDENT, "_"},