From f723701de0636ad8b4aad6179b322f72b04354b9 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Tue, 27 Jul 2021 22:21:44 +0200
Subject: patch 8.2.3230: Vim9: type error when function return type is not
 known yet

Problem:    Vim9: type error when function return type is not known yet.
Solution:   When return type is unknown, use "any". (closes #8644)
---
 src/testdir/test_vim9_builtin.vim | 10 ++++++++++
 src/version.c                     |  2 ++
 src/vim9compile.c                 |  3 +++
 3 files changed, 15 insertions(+)

diff --git a/src/testdir/test_vim9_builtin.vim b/src/testdir/test_vim9_builtin.vim
index 2001079d2..bd52f702c 100644
--- a/src/testdir/test_vim9_builtin.vim
+++ b/src/testdir/test_vim9_builtin.vim
@@ -1172,6 +1172,16 @@ def Test_get()
   var F: func = function('min', [[5, 8, 6]])
   F->get('name')->assert_equal('min')
   F->get('args')->assert_equal([[5, 8, 6]])
+
+  var lines =<< trim END
+      vim9script
+      def DoThat(): number
+        var Getqflist: func = function('getqflist', [{id: 42}])
+        return Getqflist()->get('id', 77)
+      enddef
+      assert_equal(0, DoThat())
+  END
+  CheckScriptSuccess(lines)
 enddef
 
 def Test_getbufinfo()
diff --git a/src/version.c b/src/version.c
index a628f5116..425f8f311 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3230,
 /**/
     3229,
 /**/
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 7d169f8c2..0d54db3d5 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -2130,6 +2130,9 @@ generate_PCALL(
 	    }
 	}
 	ret_type = type->tt_member;
+	if (ret_type == &t_unknown)
+	    // return type not known yet, use a runtime check
+	    ret_type = &t_any;
     }
     else
     {
-- 
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