Another parser failure

[akurtakov]

The following snippet generates "Failed to parse exception":

#!/usr/bin/env bash
echo CommandName InputFiles `#1st comment` \
     --option1 arg1 `#2nd comment` \
     --option2 arg2 `#3rd comment`

[sebthom]

Reported upstream at https://github.com/tree-sitter/tree-sitter-bash/issues/70