fix #846: time-equal garbled message when time returned from function (#868)

Author: chavacava

rule/time-equal.go

@@ -60,9 +60,9 @@ func (l *lintTimeEqual) Visit(node ast.Node) ast.Visitor {
 	var failure string
 	switch expr.Op {
 	case token.EQL:
-		failure = fmt.Sprintf("use %s.Equal(%s) instead of %q operator", expr.X, expr.Y, expr.Op)
+		failure = fmt.Sprintf("use %s.Equal(%s) instead of %q operator", gofmt(expr.X), gofmt(expr.Y), expr.Op)
 	case token.NEQ:
-		failure = fmt.Sprintf("use !%s.Equal(%s) instead of %q operator", expr.X, expr.Y, expr.Op)
+		failure = fmt.Sprintf("use !%s.Equal(%s) instead of %q operator", gofmt(expr.X), gofmt(expr.Y), expr.Op)
 	}
 
 	l.onFailure(lint.Failure{

testdata/time-equal.go

@@ -12,3 +12,7 @@ func t() bool {
 
 	return t != u // MATCH /use !t.Equal(u) instead of "!=" operator/
 }
+
+// issue #846
+func isNow(t time.Time) bool    { return t == time.Now() } // MATCH /use t.Equal(time.Now()) instead of "==" operator/
+func isNotNow(t time.Time) bool { return time.Now() != t } // MATCH /use !time.Now().Equal(t) instead of "!=" operator/