Handle powershell unexpected token with newline (#2588)

* Newline in unexpected token broke parser
* fixed test to properly capture regressions
* removed deprecated linter options for powershell

ale_linters/powershell/powershell.vim

@@ -49,11 +49,19 @@ function! ale_linters#powershell#powershell#Handle(buffer, lines) abort
                 let l:matchcount = 1
             endif
 
-            let l:item = {
-            \   'lnum': str2nr(l:match[1]),
-            \   'col': str2nr(l:match[2]),
-            \   'type': 'E',
-            \}
+            " If the match is 0, it was a failed match
+            " probably due to an unexpected token which
+            " contained a newline. Reset matchcount. to
+            " continue to the next match
+            if !empty(l:match[1])
+                let l:item = {
+                \   'lnum': str2nr(l:match[1]),
+                \   'col': str2nr(l:match[2]),
+                \   'type': 'E',
+                \}
+            else
+                let l:matchcount = 0
+            endif
         elseif l:matchcount == 2
             " Second match[0] grabs the full line in order
             " to handles the text
@@ -84,8 +92,8 @@ endfunction
 
 call ale#linter#Define('powershell', {
 \   'name': 'powershell',
-\   'executable_callback': 'ale_linters#powershell#powershell#GetExecutable',
-\   'command_callback': 'ale_linters#powershell#powershell#GetCommand',
+\   'executable': function('ale_linters#powershell#powershell#GetExecutable'),
+\   'command': function('ale_linters#powershell#powershell#GetCommand'),
 \   'output_stream': 'stdout',
 \   'callback': 'ale_linters#powershell#powershell#Handle',
 \})