patch 8.2.2002: Vim9: lambda argument shadowed by function name

Problem:    Vim9: lambda argument shadowed by function name.
Solution:   Let function name be shadowed by lambda argument. (closes #7313)

Author: brammool

src/testdir/test_vim9_func.vim

@@ -1456,6 +1456,15 @@ def Test_nested_lambda()
   CheckScriptSuccess(lines)
 enddef
 
+def Shadowed(): list<number>
+  var FuncList: list<func: number> = [{ -> 42}]
+  return FuncList->map({_, Shadowed -> Shadowed()})
+enddef
+
+def Test_lambda_arg_shadows_func()
+  assert_equal([42], Shadowed())
+enddef
+
 def Line_continuation_in_def(dir: string = ''): string
   var path: string = empty(dir)
           \ ? 'empty'

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2002,
 /**/
     2001,
 /**/

src/vim9compile.c

@@ -2712,13 +2712,19 @@ compile_call(
 	goto theend;
     }
 
-    // If we can find the function by name generate the right call.
-    // Skip global functions here, a local funcref takes precedence.
-    ufunc = find_func(name, FALSE, cctx);
-    if (ufunc != NULL && !func_is_global(ufunc))
-    {
-	res = generate_CALL(cctx, ufunc, argcount);
-	goto theend;
+    // An argument or local variable can be a function reference, this
+    // overrules a function name.
+    if (lookup_local(namebuf, varlen, cctx) == NULL
+	    && arg_exists(namebuf, varlen, NULL, NULL, NULL, cctx) != OK)
+    {
+	// If we can find the function by name generate the right call.
+	// Skip global functions here, a local funcref takes precedence.
+	ufunc = find_func(name, FALSE, cctx);
+	if (ufunc != NULL && !func_is_global(ufunc))
+	{
+	    res = generate_CALL(cctx, ufunc, argcount);
+	    goto theend;
+	}
     }
 
     // If the name is a variable, load it and use PCALL.