From c2ca935d26b3fc64a13d4e7d0583fc787efe61d0 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Wed, 25 Nov 2020 21:30:11 +0100
Subject: [PATCH] patch 8.2.2053: Vim9: lamba doesn't accept argument types

Problem:    Vim9: lamba doesn't accept argument types.
Solution:   Optionally accept argument types at the script level.
---
 src/eval.c                     | 2 +-
 src/testdir/test_vim9_expr.vim | 3 +++
 src/version.c                  | 2 ++
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/eval.c b/src/eval.c
index 6fea436054..f23d721df2 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -3266,7 +3266,7 @@ eval7(
      * Lambda: {arg, arg -> expr}
      * Dictionary: {'key': val, 'key': val}
      */
-    case '{':	ret = get_lambda_tv(arg, rettv, FALSE, evalarg);
+    case '{':	ret = get_lambda_tv(arg, rettv, in_vim9script(), evalarg);
 		if (ret == NOTDONE)
 		    ret = eval_dict(arg, rettv, evalarg, FALSE);
 		break;
diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 02f8c0ad05..57307a27ed 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -1828,6 +1828,9 @@ def Test_expr7_lambda()
 
       assert_equal(false, LambdaUsingArg(0)())
       assert_equal(true, LambdaUsingArg(1)())
+
+      var res = map([1, 2, 3], {i: number, v: number -> i + v})
+      assert_equal([1, 3, 5], res)
   END
   CheckDefAndScriptSuccess(lines)
 
diff --git a/src/version.c b/src/version.c
index c653cdc84f..bd8abac7a0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2053,
 /**/
     2052,
 /**/