parsing error with 0.89

[patricklx]

<MyComp as | abc | >
 </MyComp>

Invalid block parameters syntax: expecting the tag to be closed with ">" or "/>" after parameters list:

|
| |
|

this works:

```hbs
<MyComp as |abc| >
 </MyComp>

i think its a bit to strict on the syntax? and need improve error message

[chancancode]

Hm yea this is definitely an unintentional bug in the new parsing logic I added. Can you PR a failing test?