1.0.3

• Treat dev builds of rustc the same as a nightly, with unstable features available

1.0.2

• Add impl From<TokenTree> for TokenStream to match libproc_macro

1.0.1

• Documentation improvements
• Fail with a better error message when being built on a compiler that is too old

1.0.0

• Minimum supported rustc version is raised from 1.15 to 1.31
• Deprecated TokenStream::empty constructor has been removed in favor of TokenStream::new

0.4.30

• Implement Clone for TokenStream's IntoIter (#177, thanks @ivanbakel)

0.4.29

• Support compiling with RUSTFLAGS='-Z allow-features=' on a nightly compiler (#176, thanks @Nemo157)

0.4.28

• Avoid needlessly escaping ' inside a string literal or " inside a character literal (#60)
• Add impls of Copy, Clone, Debug, PartialEq, Eq for proc_macro2::LineColumn

0.4.27

• Add Cargo cfg "span-locations" to expose Span::start and Span::end accessors that give the line and column location of a Span (#166)

  Be aware that this involves storing more information than before inside of Spans which increases their size -- leading to possibly slower performance of any code involving proc-macro2 types (but only when the cfg is enabled).

0.4.26

• Update documentation to 2018 edition
• Rename span.unstable() method to span.unwrap(); this method is usable from a stable compiler but panics if called from outside of a procedural macro

0.4.25

• Disable stable shim when building with procmacro2_semver_exempt on a nightly compiler (#158)