Repeated Haskell-style comments in Happy quotations are treated as comments

To take a few lines out of [GHC's `Parser.y`](https://github.com/ghc/ghc/blob/584cd5ae200866fbfb480fab9591f0acf94a8033/compiler/GHC/Parser.y#L623) (because it's where I'm facing this error), consider the following code:

```
'{-# INLINE' { L _ (ITinline_prag _ _ _) } -- INLINE or INLINABLE
'{-# SPECIALISE' { L _ (ITspec_prag _) }
'{-# SPECIALISE_INLINE' { L _ (ITspec_inline_prag _ _) }
```

While the syntax highlighting continues correctly for the line containing `'{-# INLINE'`, the subsequent opening comment is interpreted as an actual comment, rather than as the use of the syntax within a literal token, and leads to the rest of the file being treated as a comment.

Reproduce the issue with the quoted lines from GHC's Parser.y, especially the repeated Haskell-style comments inside the literal tokens. Start by examining how the VS Code Haskell syntax highlighting handles the quotation, and verify that the subsequent opening comment no longer causes the rest of the file to be treated as a comment.

Written by the indexing model from the issue text.