Types of lambda parameters without parenthesis

[susliko]

Commit of tree-sitter-scala you tested this on

59ab070

A code sample showing the error

xs.map { x: Int => x }

Show the error node

(compilation_unit [0, 0] - [1, 0]
  (call_expression [0, 0] - [0, 22]
    function: (field_expression [0, 0] - [0, 6]
      value: (identifier [0, 0] - [0, 2])
      field: (identifier [0, 3] - [0, 6]))
    arguments: (block [0, 7] - [0, 22]
      (ascription_expression [0, 9] - [0, 15]
        (identifier [0, 9] - [0, 10])
        (type_identifier [0, 12] - [0, 15]))
      (ERROR [0, 16] - [0, 21]))))

What do you expect the tree to look like

It should be recognized as a lambda expression

Where are you experiencing this error?

This syntax was allowed in Scala 2. E.g. ClassFileWriters.scala