Allow Rust core types to be highlighted just like user types about atom-language-rust

[alexr00]

From @dbaeumer on February 4, 2019 8:46

Not sure if this is a theme or grammar problem.

[alexr00]

@nox, I'm not very familiar with Rust. Is this an example of the different highlighting?

[alexr00]

From @nox on February 4, 2019 10:26

    core::char::DecodeUtf16Error,
    core::char::EscapeDebug,
    core::char::EscapeDefault,
    core::char::EscapeUnicode,
    core::char::ParseCharError,
    core::char::ToLowercase,
    core::char::ToUppercase,

Basically, those identifiers always appear in a different colour wherever they are. I filed an issue here because while I mostly do Rust, this is a common thing that themes do in all editors: colour things that it considers primitive/core/whatever in a different way, and I would like to be able to disable the behaviour across the board.

[alexr00]

From @nox on February 4, 2019 10:28

Like, is there a way to tell the editor to paint things a different colour that is used by a different class of tokens, without giving it that specific other colour?

[alexr00]

I see, thanks for the example. This is an issue with the grammar we use for Rust. It categorizes char in core::char::DecodeUtf16Error as storage.type.core.rust and it should probably just categorize it as source.rust.