Changelog#

Unreleased#

Compiler#

• The compiler now reports an error when integer and float binary operators are used incorrectly in case expression guards. (Adi Salimgereyev)

• The compiler now supports string concatenation in clause guards:

  case message {
    #(version, action) if version <> ":" <> action == "v1:delete" ->
      handle_delete()
    _ -> ignore()
  }
  

  (Adi Salimgereyev)

Build tool#

• When adding a package that does not exist on Hex, the message is a bit friendlier. (Ameen Radwan)

• The gleam.toml format is now consistent. The two sausage-case fields (dev-dependencies and tag-prefix) have been replaced by snake_case versions. Files using the old names will continue to work. (Louis Pilfold)

Language server#

• The language server now allows extracting the start of a pipeline into a variable. (Giacomo Cavalieri)

Formatter#

Bug fixes#

• Fixed a bug where some bit array patterns would erroneously be marked as unreachable. (Giacomo Cavalieri)

• The compiler now correctly tracks the minimum required version for constant record updates to be >= 1.14.0. (Giacomo Cavalieri)

• The compiler now correctly tracks the minimum required version for expressions in BitArrays' size option to be >= 1.12.0. (Giacomo Cavalieri)

• Fixed a bug where the formatter would not properly format some function calls if the last argument was followed by a trailing comment. (Giacomo Cavalieri)

• Fixed a bug where the compiler would generate invalid code on the JavaScript target when using a case expression as the right hand side of an equality check in an assert. (Giacomo Cavalieri)

• The language server no longer recommends the deprecated @target attribute. (Hari Mohan)

• The compiler no longer crashes when trying to pattern match on a UtfCodepoint. (Hari Mohan)

• Fixed a bug that would result in not being able to rename an aliased pattern. (Giacomo Cavalieri)

• Added an error message when attempting to update packages that are not dependencies of the project, instead of failing silently. (Etienne Boutet, Vladislav Shakitskiy)

• The build tool now doesn't perform code generation when exporting package interface. (Andrey Kozhev)

• The "Extract constant" code action now correctly places new constant when function has documentation. For example,

  /// Wibble does some wobbling
  pub fn wibble() {
    let x = "wobble"
    //  ^ Trigger "Extract constant" here
    x
  }
  

  Previously, it would incorrectly place it below doc comment:

  /// Wibble does some wobbling
  const x = "wobble"
  
  pub fn wibble() {
    x
  }
  

  Now it will correctly place constant above doc comment:

  const x = "wobble"
  
  /// Wibble does some wobbling
  pub fn wibble() {
    x
  }
  

  (Andrey Kozhev)

• Fixed a bug where renaming would not work properly if there was an error in target file. (Surya Rose)