#[derive(Encode)] and friends break on structs with default generic arguments

[bitwiseshiftleft]

I'm testing against 2.0.0-rc.1.

The derive macros cause syntax errors when given a struct with a default generic argument, such as:

#[derive(Encode)]
struct Foo<Bar=Baz> {}

This produces the following error:

error: Invalid rust syntax, expected ', > or an ident, got Some(Punct { ch: '=', spacing: Alone, span: #0 bytes(104880..104881) })
  --> src/xxx.rs:87:15
   |
87 | struct Foo<Bar=Baz> {}

(I tested this in some project, so there is an unhelpful line number.)

[qarmin]

Same problem I have with negative numbers - error: Invalid rust syntax, expected literal, got Some(Punct { ch: '-', spacing: Alone, span: #0 bytes(20762..20763) })

#[derive(Copy, Clone, PartialEq, Eq, Encode, Decode)]
pub enum TypeOfFile {
    Unknown = -1,
}

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.