fix last/1 to be included in builtin/0

Author: itchyny

_tools/gen_builtin.go

@@ -48,6 +48,7 @@ func run(input, output string) error {
 	}
 	fds["_assign"] = nil
 	fds["_modify"] = nil
+	fds["_last"] = nil
 	t, err := astgen.Build(fds)
 	if err != nil {
 		return err

builtin.go

@@ -59,6 +59,7 @@ def walk(f):
 def first: .[0];
 def first(g): label $out | g | ., break $out;
 def last: .[-1];
+def last(g): _last(g);
 def isempty(g): label $out | (g | false, break $out), true;
 def all: all(.);
 def all(y): all(.[]; y);

builtin.jq

@@ -953,7 +953,7 @@ func (c *compiler) compileFunc(e *Func) error {
 				c.compileAssign()
 			case "_modify":
 				c.compileModify()
-			case "last":
+			case "_last":
 				c.compileLast()
 			}
 		}
@@ -1145,7 +1145,7 @@ func (c *compiler) compileModify() {
 // Appends the compiled code for the `last/1` function to
 // maximize performance avoiding unnecessary boxing.
 func (c *compiler) compileLast() {
-	defer c.appendBuiltin("last", 1)()
+	defer c.appendBuiltin("_last", 1)()
 	scope := c.newScope()
 	v, g, x := [2]int{scope.id, 0}, [2]int{scope.id, 1}, [2]int{scope.id, 2}
 	c.appends(