0.4.13

• Implement Extend<TokenStream> for TokenStream (#117)
• Optimize Extend<TokenTree> for TokenStream when building with "nightly" feature (#114)

0.4.12

• Restore support for musl targets that provide a binary releases of the compiler for musl

0.4.11

• Restore compatibility with old compilers (#112)

0.4.10

• Support building for wasm which has no proc-macro crate (#111)

0.4.9

• Fix compile on nightly

0.4.8

• Pick up fine-grained proc_macro feature gates introduced in rust-lang/rust#52081

0.4.7

• impl Default for TokenStream (#106, thanks @H2CO3)

0.4.6

• Include semver exempt APIs on docs.rs (#81, #82)

0.4.5

• Fix Display impl for Group (#98, thanks @hcpl)
• Simplify Debug representation of Ident

0.4.4

• Deprecate TokenStream::empty, provide equivalent TokenStream::new (rust-lang/rust#51073)
• Performance improvement for the common case of parsing ASCII identifiers (#94, thanks @nnethercote)