Fix printf parsing of [N] after # in verbs (fixes #26)

Author: polyfloyd

errorlint/printf.go

@@ -59,6 +59,7 @@ func (pp *printfParser) parseVerb() (*verb, error) {
 		return pp.parseVerb()
 	case '+', '#':
 		pp.next()
+		fallthrough
 	case '[':
 		var err error
 		index, err = pp.parseIndex()

errorlint/printf_test.go

@@ -42,6 +42,13 @@ func TestPrintfParser(t *testing.T) {
 				{format: "v", index: -1},
 			},
 		},
+		{
+			format: "%v %#[1]v",
+			verbs: []verb{
+				{format: "v", index: -1},
+				{format: "v", index: 1},
+			},
+		},
 	}
 
 	for _, tc := range testCases {

errorlint/testdata/src/issues/github-26.go

@@ -0,0 +1,8 @@
+package issues
+
+import "fmt"
+
+func main() {
+	err := fmt.Errorf("%v %#[1]v", struct{ string }{})
+	fmt.Println(err)
+}