patch 8.2.0561: Vim9: cannot split function call in multiple lines

Problem:    Vim9: cannot split function call in multiple lines.
Solution:   Find more arguments in following lines.

runtime/doc/vim9.txt

@@ -184,6 +184,19 @@ example, when a list spans multiple lines: >
 		'one',
 		'two',
 		]
+And when a dict spans multiple lines: >
+	let mydict = #{
+		one: 1,
+		two: 2,
+		}
+Function call: >
+	let result = Func(
+			arg1,
+			arg2
+			)
+
+Note that "enddef" cannot be used at the start of a continuation line, it ends
+the current function.
 
 
 No curly braces expansion ~

src/testdir/test_vim9_script.vim

@@ -636,16 +636,16 @@ enddef
 
 def Test_import_absolute()
   let import_lines = [
-        \ 'vim9script',
-        \ 'import exported from "' .. escape(getcwd(), '\') .. '/Xexport_abs.vim"',
-        \ 'def UseExported()',
-        \ '  g:imported_abs = exported',
-        \ '  exported = 8888',
-        \ '  g:imported_after = exported',
-        \ 'enddef',
-        \ 'UseExported()',
-        \ 'g:import_disassembled = execute("disass UseExported")',
-        \ ]
+        'vim9script',
+        'import exported from "' .. escape(getcwd(), '\') .. '/Xexport_abs.vim"',
+        'def UseExported()',
+        '  g:imported_abs = exported',
+        '  exported = 8888',
+        '  g:imported_after = exported',
+        'enddef',
+        'UseExported()',
+        'g:import_disassembled = execute("disass UseExported")',
+        ]
   writefile(import_lines, 'Ximport_abs.vim')
   writefile(s:export_script_lines, 'Xexport_abs.vim')
 
@@ -661,8 +661,8 @@ def Test_import_absolute()
         \ .. '3 STORESCRIPT exported in .*Xexport_abs.vim.*'
         \ .. 'g:imported_after = exported.*'
         \ .. '4 LOADSCRIPT exported from .*Xexport_abs.vim.*'
-        \ .. '5 STOREG g:imported_after.*'
-        \, g:import_disassembled)
+        \ .. '5 STOREG g:imported_after.*',
+        g:import_disassembled)
   unlet g:imported_abs
   unlet g:import_disassembled
 
@@ -672,10 +672,10 @@ enddef
 
 def Test_import_rtp()
   let import_lines = [
-        \ 'vim9script',
-        \ 'import exported from "Xexport_rtp.vim"',
-        \ 'g:imported_rtp = exported',
-        \ ]
+        'vim9script',
+        'import exported from "Xexport_rtp.vim"',
+        'g:imported_rtp = exported',
+        ]
   writefile(import_lines, 'Ximport_rtp.vim')
   mkdir('import')
   writefile(s:export_script_lines, 'import/Xexport_rtp.vim')
@@ -988,6 +988,11 @@ def Test_automatic_line_continuation()
       three: 3  " comment
       }
   assert_equal(#{one: 1, two: 2, three: 3}, mydict)
+
+  assert_equal(
+        ['one', 'two', 'three'],
+        split('one two three')
+        )
 enddef
 
 " Keep this last, it messes up highlighting.

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    561,
 /**/
     560,
 /**/

src/vim9compile.c

@@ -2048,6 +2048,27 @@ free_imported(cctx_T *cctx)
     ga_clear(&cctx->ctx_imports);
 }
 
+/*
+ * Get the next line of the function from "cctx".
+ * Returns NULL when at the end.
+ */
+    static char_u *
+next_line_from_context(cctx_T *cctx)
+{
+    char_u	*line = NULL;
+
+    do
+    {
+	++cctx->ctx_lnum;
+	if (cctx->ctx_lnum >= cctx->ctx_ufunc->uf_lines.ga_len)
+	    break;
+	line = ((char_u **)cctx->ctx_ufunc->uf_lines.ga_data)[cctx->ctx_lnum];
+	SOURCING_LNUM = cctx->ctx_ufunc->uf_script_ctx.sc_lnum
+							  + cctx->ctx_lnum + 1;
+    } while (line == NULL);
+    return line;
+}
+
 /*
  * Generate an instruction to load script-local variable "name", without the
  * leading "s:".
@@ -2284,8 +2305,21 @@ compile_arguments(char_u **arg, cctx_T *cctx, int *argcount)
 {
     char_u *p = *arg;
 
-    while (*p != NUL && *p != ')')
+    for (;;)
     {
+	if (*p == NUL)
+	{
+	    p = next_line_from_context(cctx);
+	    if (p == NULL)
+		break;
+	    p = skipwhite(p);
+	}
+	if (*p == ')')
+	{
+	    *arg = p + 1;
+	    return OK;
+	}
+
 	if (compile_expr1(&p, cctx) == FAIL)
 	    return FAIL;
 	++*argcount;
@@ -2298,19 +2332,14 @@ compile_arguments(char_u **arg, cctx_T *cctx, int *argcount)
 	if (*p == ',')
 	{
 	    ++p;
-	    if (!VIM_ISWHITE(*p))
+	    if (*p != NUL && !VIM_ISWHITE(*p))
 		semsg(_(e_white_after), ",");
 	}
 	p = skipwhite(p);
     }
-    p = skipwhite(p);
-    if (*p != ')')
-    {
-	emsg(_(e_missing_close));
-	return FAIL;
-    }
-    *arg = p + 1;
-    return OK;
+
+    emsg(_(e_missing_close));
+    return FAIL;
 }
 
 /*
@@ -2534,27 +2563,6 @@ need_type(type_T *actual, type_T *expected, int offset, cctx_T *cctx)
     return OK;
 }
 
-/*
- * Get the next line of the function from "cctx".
- * Returns NULL when at the end.
- */
-    static char_u *
-next_line_from_context(cctx_T *cctx)
-{
-    char_u	*line = NULL;
-
-    do
-    {
-	++cctx->ctx_lnum;
-	if (cctx->ctx_lnum >= cctx->ctx_ufunc->uf_lines.ga_len)
-	    break;
-	line = ((char_u **)cctx->ctx_ufunc->uf_lines.ga_data)[cctx->ctx_lnum];
-	SOURCING_LNUM = cctx->ctx_ufunc->uf_script_ctx.sc_lnum
-							  + cctx->ctx_lnum + 1;
-    } while (line == NULL);
-    return line;
-}
-
 /*
  * parse a list: [expr, expr]
  * "*arg" points to the '['.