patch 8.2.1045: Vim9: line break before operator does not work

Problem:    Vim9: line break before operator does not work.
Solution:   Peek the next line for an operator.

src/testdir/test_vim9_expr.vim

@@ -13,6 +13,9 @@ def Test_expr1()
     assert_equal('one', 0.1 ? 'one' : 'two')
   endif
   assert_equal('one', 'x' ? 'one' : 'two')
+  assert_equal('one', 'x'
+  			? 'one'
+			: 'two')
   assert_equal('one', 0z1234 ? 'one' : 'two')
   assert_equal('one', [0] ? 'one' : 'two')
   assert_equal('one', #{x: 0} ? 'one' : 'two')
@@ -70,6 +73,8 @@ def Test_expr2()
 		    0 ||
 		    7)
   assert_equal(0, 0 || 0)
+  assert_equal(0, 0
+  		    || 0)
   assert_equal('', 0 || '')
 
   g:vals = []
@@ -81,7 +86,9 @@ def Test_expr2()
   assert_equal([0, 5], g:vals)
 
   g:vals = []
-  assert_equal(4, Record(0) || Record(4) || Record(0))
+  assert_equal(4, Record(0)
+		      || Record(4)
+		      || Record(0))
   assert_equal([0, 4], g:vals)
 
   g:vals = []
@@ -104,7 +111,9 @@ def Test_expr3()
   assert_equal(0, 0 &&
 		0 &&
 		7)
-  assert_equal(7, 2 && 3 && 7)
+  assert_equal(7, 2
+  		    && 3
+		    && 7)
   assert_equal(0, 0 && 0)
   assert_equal(0, 0 && '')
   assert_equal('', 8 && '')
@@ -158,7 +167,8 @@ def Test_expr4_equal()
   assert_equal(true, true == true)
   assert_equal(false, true ==
 			false)
-  assert_equal(true, true == trueVar)
+  assert_equal(true, true
+			== trueVar)
   assert_equal(false, true == falseVar)
   assert_equal(true, true == g:atrue)
   assert_equal(false, g:atrue == false)
@@ -250,7 +260,8 @@ def Test_expr4_notequal()
   assert_equal(false, true != true)
   assert_equal(true, true !=
 			false)
-  assert_equal(false, true != trueVar)
+  assert_equal(false, true
+  			!= trueVar)
   assert_equal(true, true != falseVar)
   assert_equal(false, true != g:atrue)
   assert_equal(true, g:atrue != false)
@@ -334,7 +345,8 @@ def Test_expr4_greater()
   assert_true(nr2 >
 		1)
   assert_false(nr2 > 2)
-  assert_false(nr2 > 3)
+  assert_false(nr2
+  		    > 3)
   if has('float')
     let ff = 2.0
     assert_true(ff > 0.0)
@@ -367,7 +379,8 @@ def Test_expr4_smaller()
   assert_false(2 < 0)
   assert_false(2 <
 			2)
-  assert_true(2 < 3)
+  assert_true(2
+  		< 3)
   let nr2 = 2
   assert_false(nr2 < 0)
   assert_false(nr2 < 2)
@@ -385,7 +398,8 @@ def Test_expr4_smallerequal()
   assert_false(2 <= 0)
   assert_false(2 <=
 			1)
-  assert_true(2 <= 2)
+  assert_true(2
+  		<= 2)
   assert_true(2 <= 3)
   let nr2 = 2
   assert_false(nr2 <= 0)
@@ -404,6 +418,8 @@ enddef
 " test =~ comperator
 def Test_expr4_match()
   assert_equal(false, '2' =~ '0')
+  assert_equal(false, ''
+  			 =~ '0')
   assert_equal(true, '2' =~
 			'[0-9]')
 enddef
@@ -411,6 +427,8 @@ enddef
 " test !~ comperator
 def Test_expr4_nomatch()
   assert_equal(true, '2' !~ '0')
+  assert_equal(true, ''
+  			!~ '0')
   assert_equal(false, '2' !~
 			'[0-9]')
 enddef
@@ -424,7 +442,8 @@ def Test_expr4_is()
 		other)
 
   let myblob = 0z1234
-  assert_false(myblob is 0z1234)
+  assert_false(myblob
+  			is 0z1234)
   let otherblob = myblob
   assert_true(myblob is otherblob)
 enddef
@@ -439,7 +458,8 @@ def Test_expr4_isnot()
 			other)
 
   let myblob = 0z1234
-  assert_true(myblob isnot 0z1234)
+  assert_true(myblob
+  		isnot 0z1234)
   let otherblob = myblob
   assert_false(myblob isnot otherblob)
 enddef
@@ -522,26 +542,30 @@ def Test_expr5()
   assert_equal(66, 60 + 6)
   assert_equal(70, 60 +
 			g:anint)
-  assert_equal(9, g:alsoint + 5)
+  assert_equal(9, g:alsoint
+  			+ 5)
   assert_equal(14, g:alsoint + g:anint)
   assert_equal([1, 2, 3, 4], [1] + g:alist)
 
   assert_equal(54, 60 - 6)
   assert_equal(50, 60 -
 		    g:anint)
-  assert_equal(-1, g:alsoint - 5)
+  assert_equal(-1, g:alsoint
+  			- 5)
   assert_equal(-6, g:alsoint - g:anint)
 
   assert_equal('hello', 'hel' .. 'lo')
   assert_equal('hello 123', 'hello ' ..
 					123)
-  assert_equal('hello 123', 'hello ' ..  123)
+  assert_equal('hello 123', 'hello '
+  				..  123)
   assert_equal('123 hello', 123 .. ' hello')
   assert_equal('123456', 123 .. 456)
 
   assert_equal([1, 2, 3, 4], [1, 2] + [3, 4])
   assert_equal(0z11223344, 0z1122 + 0z3344)
-  assert_equal(0z112201ab, 0z1122 + g:ablob)
+  assert_equal(0z112201ab, 0z1122
+  				+ g:ablob)
   assert_equal(0z01ab3344, g:ablob + 0z3344)
   assert_equal(0z01ab01ab, g:ablob + g:ablob)
 enddef
@@ -554,13 +578,15 @@ def Test_expr5_float()
     assert_equal(66.0, 60.0 + 6)
     assert_equal(66.0, 60 +
 			 6.0)
-    assert_equal(5.1, g:afloat + 5)
+    assert_equal(5.1, g:afloat
+    			+ 5)
     assert_equal(8.1, 8 + g:afloat)
     assert_equal(10.1, g:anint + g:afloat)
     assert_equal(10.1, g:afloat + g:anint)
 
     assert_equal(54.0, 60.0 - 6.0)
-    assert_equal(54.0, 60.0 - 6)
+    assert_equal(54.0, 60.0
+    			    - 6)
     assert_equal(54.0, 60 - 6.0)
     assert_equal(-4.9, g:afloat - 5)
     assert_equal(7.9, 8 - g:afloat)
@@ -599,20 +625,23 @@ def Test_expr6()
   assert_equal(36, 6 * 6)
   assert_equal(24, 6 *
 			g:alsoint)
-  assert_equal(24, g:alsoint * 6)
+  assert_equal(24, g:alsoint
+  			* 6)
   assert_equal(40, g:anint * g:alsoint)
 
   assert_equal(10, 60 / 6)
   assert_equal(6, 60 /
 			g:anint)
   assert_equal(1, g:anint / 6)
-  assert_equal(2, g:anint / g:alsoint)
+  assert_equal(2, g:anint
+  			/ g:alsoint)
 
   assert_equal(5, 11 % 6)
   assert_equal(4, g:anint % 6)
   assert_equal(3, 13 %
 			g:anint)
-  assert_equal(2, g:anint % g:alsoint)
+  assert_equal(2, g:anint
+  			% g:alsoint)
 
   assert_equal(4, 6 * 4 / 6)
 
@@ -623,8 +652,10 @@ def Test_expr6()
   if has('float')
     let xf = [2.0]
     let yf = [3.0]
-    assert_equal(5.0, xf[0] + yf[0])
-    assert_equal(6.0, xf[0] * yf[0])
+    assert_equal(5.0, xf[0]
+    			+ yf[0])
+    assert_equal(6.0, xf[0]
+    			* yf[0])
   endif
 
   call CheckDefFailure(["let x = 6 * xxx"], 'E1001')

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1045,
 /**/
     1044,
 /**/

src/vim9compile.c

@@ -2413,6 +2413,27 @@ peek_next_line(cctx_T *cctx)
     return NULL;
 }
 
+/*
+ * Called when checking for a following operator at "arg".  When the rest of
+ * the line is empty or only a comment, peek the next line.  If there is a next
+ * line return a pointer to it and set "nextp".
+ * Otherwise skip over white space.
+ */
+    static char_u *
+may_peek_next_line(cctx_T *cctx, char_u *arg, char_u **nextp)
+{
+    char_u *p = skipwhite(arg);
+
+    *nextp = NULL;
+    if (*p == NUL || (VIM_ISWHITE(*arg) && comment_start(p)))
+    {
+	*nextp = peek_next_line(cctx);
+	if (*nextp != NULL)
+	    return *nextp;
+    }
+    return p;
+}
+
 /*
  * Get the next line of the function from "cctx".
  * Skips over empty lines.  Skips over comment lines if "skip_comment" is TRUE.
@@ -3947,6 +3968,7 @@ compile_expr7(
 compile_expr6(char_u **arg, cctx_T *cctx, ppconst_T *ppconst)
 {
     char_u	*op;
+    char_u	*next;
     int		ppconst_used = ppconst->pp_used;
 
     // get the first expression
@@ -3958,9 +3980,14 @@ compile_expr6(char_u **arg, cctx_T *cctx, ppconst_T *ppconst)
      */
     for (;;)
     {
-	op = skipwhite(*arg);
+	op = may_peek_next_line(cctx, *arg, &next);
 	if (*op != '*' && *op != '/' && *op != '%')
 	    break;
+	if (next != NULL)
+	{
+	    *arg = next_line_from_context(cctx, TRUE);
+	    op = skipwhite(*arg);
+	}
 
 	if (!IS_WHITE_OR_NUL(**arg) || !IS_WHITE_OR_NUL(op[1]))
 	{
@@ -4018,6 +4045,7 @@ compile_expr6(char_u **arg, cctx_T *cctx, ppconst_T *ppconst)
 compile_expr5(char_u **arg, cctx_T *cctx, ppconst_T *ppconst)
 {
     char_u	*op;
+    char_u	*next;
     int		oplen;
     int		ppconst_used = ppconst->pp_used;
 
@@ -4030,10 +4058,15 @@ compile_expr5(char_u **arg, cctx_T *cctx, ppconst_T *ppconst)
      */
     for (;;)
     {
-	op = skipwhite(*arg);
-	if (*op != '+' && *op != '-' && !(*op == '.' && (*(*arg + 1) == '.')))
+	op = may_peek_next_line(cctx, *arg, &next);
+	if (*op != '+' && *op != '-' && !(*op == '.' && *(op + 1) == '.'))
 	    break;
 	oplen = (*op == '.' ? 2 : 1);
+	if (next != NULL)
+	{
+	    *arg = next_line_from_context(cctx, TRUE);
+	    op = skipwhite(*arg);
+	}
 
 	if (!IS_WHITE_OR_NUL(**arg) || !IS_WHITE_OR_NUL(op[oplen]))
 	{
@@ -4127,6 +4160,7 @@ compile_expr4(char_u **arg, cctx_T *cctx, ppconst_T *ppconst)
 {
     exptype_T	type = EXPR_UNKNOWN;
     char_u	*p;
+    char_u	*next;
     int		len = 2;
     int		type_is = FALSE;
     int		ppconst_used = ppconst->pp_used;
@@ -4135,7 +4169,7 @@ compile_expr4(char_u **arg, cctx_T *cctx, ppconst_T *ppconst)
     if (compile_expr5(arg, cctx, ppconst) == FAIL)
 	return FAIL;
 
-    p = skipwhite(*arg);
+    p = may_peek_next_line(cctx, *arg, &next);
     type = get_compare_type(p, &len, &type_is);
 
     /*
@@ -4145,6 +4179,11 @@ compile_expr4(char_u **arg, cctx_T *cctx, ppconst_T *ppconst)
     {
 	int ic = FALSE;  // Default: do not ignore case
 
+	if (next != NULL)
+	{
+	    *arg = next_line_from_context(cctx, TRUE);
+	    p = skipwhite(*arg);
+	}
 	if (type_is && (p[len] == '?' || p[len] == '#'))
 	{
 	    semsg(_(e_invexpr2), *arg);
@@ -4221,7 +4260,8 @@ compile_and_or(
 	ppconst_T *ppconst,
 	int	ppconst_used UNUSED)
 {
-    char_u	*p = skipwhite(*arg);
+    char_u	*next;
+    char_u	*p = may_peek_next_line(cctx, *arg, &next);
     int		opchar = *op;
 
     if (p[0] == opchar && p[1] == opchar)
@@ -4235,6 +4275,12 @@ compile_and_or(
 	ga_init2(&end_ga, sizeof(int), 10);
 	while (p[0] == opchar && p[1] == opchar)
 	{
+	    if (next != NULL)
+	    {
+		*arg = next_line_from_context(cctx, TRUE);
+		p = skipwhite(*arg);
+	    }
+
 	    if (!IS_WHITE_OR_NUL(**arg) || !IS_WHITE_OR_NUL(p[2]))
 	    {
 		semsg(_(e_white_both), op);
@@ -4265,7 +4311,8 @@ compile_and_or(
 		ga_clear(&end_ga);
 		return FAIL;
 	    }
-	    p = skipwhite(*arg);
+
+	    p = may_peek_next_line(cctx, *arg, &next);
 	}
 	generate_ppconst(cctx, ppconst);
 
@@ -4349,12 +4396,13 @@ compile_expr1(char_u **arg,  cctx_T *cctx, ppconst_T *ppconst)
 {
     char_u	*p;
     int		ppconst_used = ppconst->pp_used;
+    char_u	*next;
 
     // Evaluate the first expression.
     if (compile_expr2(arg, cctx, ppconst) == FAIL)
 	return FAIL;
 
-    p = skipwhite(*arg);
+    p = may_peek_next_line(cctx, *arg, &next);
     if (*p == '?')
     {
 	garray_T	*instr = &cctx->ctx_instr;
@@ -4368,6 +4416,12 @@ compile_expr1(char_u **arg,  cctx_T *cctx, ppconst_T *ppconst)
 	int		const_value = FALSE;
 	int		save_skip = cctx->ctx_skip;
 
+	if (next != NULL)
+	{
+	    *arg = next_line_from_context(cctx, TRUE);
+	    p = skipwhite(*arg);
+	}
+
 	if (!IS_WHITE_OR_NUL(**arg) || !IS_WHITE_OR_NUL(p[1]))
 	{
 	    semsg(_(e_white_both), "?");
@@ -4415,12 +4469,18 @@ compile_expr1(char_u **arg,  cctx_T *cctx, ppconst_T *ppconst)
 	}
 
 	// Check for the ":".
-	p = skipwhite(*arg);
+	p = may_peek_next_line(cctx, *arg, &next);
 	if (*p != ':')
 	{
 	    emsg(_(e_missing_colon));
 	    return FAIL;
 	}
+	if (next != NULL)
+	{
+	    *arg = next_line_from_context(cctx, TRUE);
+	    p = skipwhite(*arg);
+	}
+
 	if (!IS_WHITE_OR_NUL(**arg) || !IS_WHITE_OR_NUL(p[1]))
 	{
 	    semsg(_(e_white_both), ":");