patch 8.2.2642: Vim9: no clear error for wrong inline function

Problem:    Vim9: no clear error for wrong inline function.
Solution:   Check for something following the "{".

Author: brammool

src/testdir/test_vim9_expr.vim

@@ -1963,6 +1963,11 @@ def Test_expr7_lambda_block()
       assert_equal(['no', 'yes', 'no'], dll)
   END
   CheckDefAndScriptSuccess(lines)
+
+  lines =<< trim END
+      map([1, 2], (k, v) => { redrawt })
+  END
+  CheckDefAndScriptFailure(lines, 'E488')
 enddef
 
 def NewLambdaWithComments(): func

src/userfunc.c

@@ -954,10 +954,15 @@ lambda_function_body(
     int		lnum_save = -1;
     linenr_T	sourcing_lnum_top = SOURCING_LNUM;
 
+    if (!ends_excmd2(*arg, skipwhite(*arg + 1)))
+    {
+	semsg(_(e_trailing_arg), *arg + 1);
+	return FAIL;
+    }
+
     CLEAR_FIELD(eap);
     eap.cmdidx = CMD_block;
     eap.forceit = FALSE;
-    eap.arg = *arg + 1;
     eap.cmdlinep = &cmdline;
     eap.skip = !evaluate;
     if (evalarg->eval_cctx != NULL)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2642,
 /**/
     2641,
 /**/