fix parsing of tab indent in double-quote

scanner/scanner.go

@@ -338,7 +338,17 @@ func (s *Scanner) scanDoubleQuote(ctx *Context) (*token.Token, error) {
 				}
 			}
 			continue
-		} else if isFirstLineChar && (c == ' ' || c == '\t') {
+		} else if isFirstLineChar && c == ' ' {
+			continue
+		} else if isFirstLineChar && c == '\t' {
+			if s.lastDelimColumn >= s.column {
+				return nil, ErrInvalidToken(
+					token.Invalid(
+						"tab character cannot be used for indentation in double-quoted text",
+						string(ctx.obuf), s.pos(),
+					),
+				)
+			}
 			continue
 		} else if c == '\\' {
 			isFirstLineChar = false

yaml_test_suite_test.go

@@ -58,7 +58,6 @@ var failureTestNames = []string{
 	"spec-example-9-6-stream",
 	"spec-example-9-6-stream-1-3",
 	"tabs-in-various-contexts/003",
-	"tabs-that-look-like-indentation/01",
 	"tabs-that-look-like-indentation/04",
 	"tag-shorthand-used-in-documents-but-only-defined-in-the-first",
 	"trailing-line-of-spaces/01",             // last '\n' character is needed ?