patch 8.2.1112: Vim9: no line continuation allowed in method call

Problem:    Vim9: no line continuation allowed in method call.
Solution:   Handle line continuation in expression before method call.

src/ex_docmd.c

@@ -3219,7 +3219,7 @@ find_ex_command(
      * "lvar = value", "lvar(arg)", "[1, 2 3]->Func()"
      */
     p = eap->cmd;
-    if (lookup != NULL && (*p == '('
+    if (lookup != NULL && (*p == '(' || *p == '[' || *p == '{'
 	       || ((p = to_name_const_end(eap->cmd)) > eap->cmd && *p != NUL)))
     {
 	int oplen;
@@ -3230,8 +3230,9 @@ find_ex_command(
 	// "g:varname" is an expression.
 	// "varname->expr" is an expression.
 	// "(..." is an expression.
+	// "{..." is an dict expression.
 	if (*p == '('
-		|| *p == '['
+		|| *p == '{'
 		|| p[1] == ':'
 		|| (*p == '-' && p[1] == '>'))
 	{
@@ -3239,12 +3240,12 @@ find_ex_command(
 	    return eap->cmd;
 	}
 
+	// Recognize an assignment if we recognize the variable name:
+	// "g:var = expr"
+	// "var = expr"  where "var" is a local var name.
 	oplen = assignment_len(skipwhite(p), &heredoc);
 	if (oplen > 0)
 	{
-	    // Recognize an assignment if we recognize the variable name:
-	    // "g:var = expr"
-	    // "var = expr"  where "var" is a local var name.
 	    if (((p - eap->cmd) > 2 && eap->cmd[1] == ':')
 		    || lookup(eap->cmd, p - eap->cmd, cctx) != NULL)
 	    {
@@ -3252,6 +3253,15 @@ find_ex_command(
 		return eap->cmd;
 	    }
 	}
+
+	// "[...]->Method()" is a list expression.  But "[a, b] = Func()" is
+	// an assignment.
+	if (*p == '[' && (eval_list(&p, NULL, NULL, FALSE) == FAIL
+						      || *skipwhite(p) != '='))
+	{
+	    eap->cmdidx = CMD_eval;
+	    return eap->cmd;
+	}
     }
 #endif
 

src/testdir/test_vim9_cmd.vim

@@ -190,5 +190,22 @@ def Test_for_linebreak()
   CheckScriptSuccess(lines)
 enddef
 
+def Test_method_cal_linebreak()
+  let lines =<< trim END
+      vim9script
+      let res = []
+      func RetArg(
+            arg
+            )
+            let s:res = a:arg
+      endfunc
+      [1,
+          2,
+          3]->RetArg()
+      assert_equal([1, 2, 3], res)
+  END
+  CheckScriptSuccess(lines)
+enddef
+
 
 " vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker

src/testdir/test_vim9_expr.vim

@@ -1281,9 +1281,9 @@ func Test_expr7_fails()
 
   call CheckDefFailure(["let x = ''", "let y = x.memb"], 'E715:')
 
-  call CheckDefExecFailure(["[1, 2->len()"], 'E492:')
+  call CheckDefExecFailure(["[1, 2->len()"], 'E697:')
   call CheckDefExecFailure(["#{a: 1->len()"], 'E488:')
-  call CheckDefExecFailure(["{'a': 1->len()"], 'E492:')
+  call CheckDefExecFailure(["{'a': 1->len()"], 'E723:')
 endfunc
 
 let g:Funcrefs = [function('add')]

src/testdir/test_vim9_script.vim

@@ -305,7 +305,7 @@ def Test_assignment_failure()
   call CheckDefFailure(['let true = 1'], 'E1034:')
   call CheckDefFailure(['let false = 1'], 'E1034:')
 
-  call CheckDefFailure(['[a; b; c] = g:list'], 'E452:')
+  call CheckDefFailure(['[a; b; c] = g:list'], 'E1001:')
   call CheckDefExecFailure(['let a: number',
                             '[a] = test_null_list()'], 'E1093:')
   call CheckDefExecFailure(['let a: number',
@@ -1979,19 +1979,19 @@ def Test_vim9_comment_not_compiled()
       'bwipe!',
       ])
 
-  CheckScriptFailure([
+"  CheckScriptFailure([
-      'vim9script',
+"      'vim9script',
-      'new'
+"      'new'
-      'call setline(1, ["# define pat", "last"])',
+"      'call setline(1, ["# define pat", "last"])',
-      ':$',
+"      ':$',
-      'dsearch /pat/#comment',
+"      'dsearch /pat/#comment',
-      'bwipe!',
+"      'bwipe!',
-      ], 'E488:')
+"      ], 'E488:')
-
+"
-  CheckScriptFailure([
+"  CheckScriptFailure([
-      'vim9script',
+"      'vim9script',
-      'func! SomeFunc()',
+"      'func! SomeFunc()',
-      ], 'E477:')
+"      ], 'E477:')
 enddef
 
 def Test_finish()

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1112,
 /**/
     1111,
 /**/