default is no more a function modifier so remove it

[calixteman]

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According to https://doc.rust-lang.org/reference/items/functions.html we could remove default. Its presence in the grammar leads to error with for example:

pub struct A {
    a: default::C,
}

And nothing in: https://doc.rust-lang.org/reference/keywords.html

@maxbrunsfeld are you ok to remove it ? if yes I'll do the PR.

[maxbrunsfeld]

That sounds good. I can't really remember the story behind the default modifier. If removing it allows us to parse code successfully that we couldn't parse before, I'm 👍 .

[amaanq]

The given example parses correctly now