Skip to main content


· One min read

MoonBit Update

  • Support array.iter intrinsic and annotate functions in the standard library, enabling inline loops in specific cases to improve runtime efficiency.

    /// @intrinsic %array.iter
    pub fn iter[T](self : Array[T], f : (T) -> Unit) -> Unit {
    for i = 0; i < self.length(); i = i + 1 {

Toolchain Update

  • Support the experimental code coverage tool:
    • The tool has experimentally supported MoonBit Core CI.
    • We are optimizing the user-facing interface.



  • By default, the unsafe/throw/raise warnings in Alerts pragmas are turned off, while deprecated alerts are enabled.
  • moonfmt
    • Fixed an issue where comments were misaligned after printing literals with negative signs.
    • Fixed an issue where parentheses disappeared after printing literals with negative signs.
  • Fixed variable highlighting.
  • moonrun now supports printing UTF-16 strings.

Build System Update

  • expect test now supports Unicode characters.