Crystal 1.17.0 released!

NewsBot · 16 July 2025 12:23

Crystal 1.17.0 has been released.

Breaking changes

stdlib

Make Colorize.on_tty_only! the default behavior (#15881, thanks @HertzDevil)

(concurrency) Rename execution contexts + improve their docs (#15936, thanks @ysbaddaden)

(files) Refactor IO.pipe blocking mode (#15823, thanks @ysbaddaden)

(files) Fix: set IO::Stapled.pipe blocking args to nil, as per IO.pipe (#15925, thanks @ysbaddaden)

(networking) Refactor Socket blocking mode (#15804, thanks @ysbaddaden)

(runtime) Let the event loop decide the blocking mode of File (#15930, thanks @ysbaddaden)

(serialization) Fix: libxml manual memory management (#15906, #15933, thanks @ysbaddaden)

(system) Turn SystemError.from_errno into a macro (#15874, thanks @straight-shoota)

Features

lang

(macros) Handle properly stringifying single line blocks (#15568, thanks @Blacksmoke16)

(macros) Handle properly stringifying multiline named tuple literals ([#15566], thanks @Blacksmoke16)

(macros) Handle properly stringifying multiline calls ([#15691], thanks @Blacksmoke16)

(macros) Handle significant whitespace before a blocks body ([#15692], thanks @Blacksmoke16)

(macros) Support {% if ...; end; ... %} macro expressions ([#15917], thanks @HertzDevil)

(macros) Support {% elsif %} when stringifying MacroIf nodes ([#15928], thanks @HertzDevil)

[#15566…

Link: Release 1.17.0 · crystal-lang/crystal · GitHub