This PR fixes an issue in Slim templates where a single quote `'` at the
start of the line (excluding white space) is considered a line indicator
for verbatim text. It is not considered a string in this scenario.
So something like this:
```slim
div
'Foo'
```
Will compile to:
```html
<div>Foo'</div>
```
Fixes: #17081
cc3e852791