patch 9.0.1508: catch does not work when lines are joined with a newline

Problem:    Catch does not work when lines are joined with a newline.
Solution:   Set "nextcmd" appropriately. (closes #12348)

src/eval.c

@@ -2699,12 +2699,15 @@ eval0_retarg(
 		semsg(_(e_invalid_expression_str), arg);
 	}
 
-	// Some of the expression may not have been consumed.  Do not check for
-	// a next command to avoid more errors, unless "|" is following, which
-	// could only be a command separator.
-	if (eap != NULL && p != NULL
-			  &&  skipwhite(p)[0] == '|' && skipwhite(p)[1] != '|')
-	    eap->nextcmd = check_nextcmd(p);
+	if (eap != NULL && p != NULL)
+	{
+	    // Some of the expression may not have been consumed.
+	    // Only execute a next command if it cannot be a "||" operator.
+	    // The next command may be "catch".
+	    char_u *nextcmd = check_nextcmd(p);
+	    if (nextcmd != NULL && *nextcmd != '|')
+		eap->nextcmd = nextcmd;
+	}
 	return FAIL;
     }
 

src/testdir/test_trycatch.vim

@@ -2220,6 +2220,36 @@ func Test_BufEnter_exception()
   %bwipe!
 endfunc
 
+" Test for using try/catch when lines are joined by "|" or "\n"           {{{1
+func Test_try_catch_nextcmd()
+  func Throw()
+    throw "Failure"
+  endfunc
+
+  let lines =<< trim END
+    try
+      let s:x = Throw()
+    catch
+      let g:caught = 1
+    endtry
+  END
+
+  let g:caught = 0
+  call execute(lines)
+  call assert_equal(1, g:caught)
+
+  let g:caught = 0
+  call execute(join(lines, '|'))
+  call assert_equal(1, g:caught)
+
+  let g:caught = 0
+  call execute(join(lines, "\n"))
+  call assert_equal(1, g:caught)
+
+  unlet g:caught
+  delfunc Throw
+endfunc
+
 " Test for using try/catch in a user command with a failing expression    {{{1
 func Test_user_command_try_catch()
   let lines =<< trim END

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1508,
 /**/
     1507,
 /**/