Don't highlight top-level-only keywords at different levels

[Hi-Angel]

The keywords being modified here only represented keywords when they are at the beginning of a line with optional whitespace.

At different levels these would represent valid record fields or other identifiers.

This was tested by adding the following code to a PureScript file:

type Foo = { type :: Int
           , module :: Int
           , import :: Int
           , data :: Int
           , class :: Int
           , newtype :: Int
           , instance :: Int
           }

…and checking that compilation succeeds.

[Hi-Angel]

upd: added instance.

[Hi-Angel]

@kritzcreek , ping?

[Hi-Angel]

ping

[Hi-Angel]

ping

[Hi-Angel]

New commit:

Rename keyword "deriving" to "derive"

PureScript, as opposed to Haskell, doesn't seem to have `deriving` as
a keyword. I grepped over `purescript` compiler `tests/` directory to
be sure. Instead it has `derive` keyword, which is a top level one
that serves similar purpose to "deriving".

So rename `deriving` to `derive`.

[Hi-Angel]

@purcell hello, it seems this repository became unmaintained. It has lots of PRs at this point, one of them even fixes a regression, but there's no one to review and merge the code. The amount of PRs became so large at this point that some changes even conflict with each other, and the last commit I had to add to this PR instead of making it a separate one.

Do you mind giving me maintainer permissions? I am currently using PureScript, so I'm interested in making sure it works. I won't promise to fix issues though (unless they're regressions, of course), but I do fix from time to time some things that I stumble upon during the mode usage.

I am a co-maintainer to color-identifiers-mode.

[purcell]

Okay, first of all I'm merging this, thanks, and taking a quick look at other PRs to get a sense of things.

[Hi-Angel]

Thank you!