patch 8.2.2081: Vim9: cannot handle a linebreak after "=" in assignment

Problem:    Vim9: cannot handle a linebreak after "=" in assignment.
Solution:   Skip over linebreak. (closes #7407)

src/testdir/test_vim9_assign.vim

@@ -225,6 +225,21 @@ def Test_assignment()
   END
 enddef
 
+def Test_assign_linebreak()
+  var nr: number
+  nr =
+      123
+  assert_equal(123, nr)
+
+  var n2: number
+  [nr, n2] =
+     [12, 34]
+  assert_equal(12, nr)
+  assert_equal(34, n2)
+
+  CheckDefFailure(["var x = #"], 'E1097:', 2)
+enddef
+
 def Test_assign_index()
   # list of list
   var l1: list<number>

src/testdir/test_vim9_expr.vim

@@ -1940,7 +1940,6 @@ def Test_expr7_dict()
   CheckDefFailure(["var x = {'a': xxx}"], 'E1001:', 1)
   CheckDefFailure(["var x = {xx-x: 8}"], 'E1001:', 1)
   CheckDefFailure(["var x = #{a: 1, a: 2}"], 'E721:', 1)
-  CheckDefFailure(["var x = #"], 'E1015:', 1)
   CheckDefExecFailure(["var x = g:anint.member"], 'E715:', 1)
   CheckDefExecFailure(["var x = g:dict_empty.member"], 'E716:', 1)
 

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2081,
 /**/
     2080,
 /**/

src/vim9compile.c

@@ -5670,6 +5670,7 @@ compile_assignment(char_u *arg, exarg_T *eap, cmdidx_T cmdidx, cctx_T *cctx)
 	    else if (oplen > 0)
 	    {
 		int	is_const = FALSE;
+		char_u	*wp;
 
 		// For "var = expr" evaluate the expression.
 		if (var_count == 0)
@@ -5694,7 +5695,10 @@ compile_assignment(char_u *arg, exarg_T *eap, cmdidx_T cmdidx, cctx_T *cctx)
 		    if (new_local)
 			--cctx->ctx_locals.ga_len;
 		    instr_count = instr->ga_len;
-		    p = skipwhite(op + oplen);
+		    wp = op + oplen;
+		    p = skipwhite(wp);
+		    if (may_get_next_line_error(wp, &p, cctx) == FAIL)
+			goto theend;
 		    r = compile_expr0_ext(&p, cctx, &is_const);
 		    if (new_local)
 			++cctx->ctx_locals.ga_len;
@@ -5712,7 +5716,7 @@ compile_assignment(char_u *arg, exarg_T *eap, cmdidx_T cmdidx, cctx_T *cctx)
 		    // For "[var, var] = expr" get the "var_idx" item from the
 		    // list.
 		    if (generate_GETITEM(cctx, var_idx) == FAIL)
-			return FAIL;
+			goto theend;
 		}
 
 		rhs_type = stack->ga_len == 0 ? &t_void