Changelog#

Unreleased#

Compiler#

• The compiler now issues a friendlier error when attempting to pattern match on both the prefix and suffix of a string:

  error: Syntax error
    ┌─ /src/parse/error.gleam:2:23
    │
  2 │     "prefix" <> infix <> "suffix" -> infix
    │                       ^^^^^^^^^^^ This pattern is not allowed
  
  A string pattern can only match on a literal string prefix.
  
  Matching on a literal suffix is not possible, because `infix` would have an
  unknown size.
  

  (Gavin Morrow)

Build tool#

• The build tool now generates Hexdocs URLs using the new format of package.hexdocs.pm rather than hexdocs.pm/package. (Surya Rose)

Language server#

Formatter#

Bug fixes#

• When using the language server to extract a function from within an anonymous function, the return value of the extracted function is respected.

  For example,

  fn wibble() {
    let wobble = fn() {
      let random_number = 4
      random_number * 42 // <- Extracting this line
    }
  }
  

  is turned into

  fn wibble() {
    let wobble = fn() {
      let random_number = 4
      function(random_number)
    }
  }
  
  fn function(random_number: Int) -> Int {
    random_number * 42
  }
  

  Gavin Morrow