v0.19.0

Added

• ArrayNode now has a contains_splat? flag if it has a splatted element in it.
• All of the remaining encodings have been implemented.
• Allow forwarding & in a method that has a ... parameter.
• Many statements that are found in non-statement positions are being properly rejected now.
• Void values are now properly checked.
• Referencing a parameter in its own default value is now properly rejected.
• DATA/__END__ is now parsed as its own field on parse result (data_loc) as opposed to as a comment.
• Blank * now properly forwards into arrays.
• ImplicitRestNode is introduced to represent the implicit rest of a destructure.
• We now support negative start lines.
• StringNode#heredoc?, InterpolatedStringNode#heredoc?, XStringNode#heredoc?, and InterpolatedXStringNode#heredoc? are introduced.
• NumberedParametersNode is introduced to represent the implicit set of parameters when numbered parameters are used.
• Prism::parse_success? and Prism::parse_failure? are introduced to bypass reifying the AST.
• We now emit a warning for constant assignments in method definitions.
• We now provide flags on strings and xstrings to indicate the correct encoding.
• The hash pattern rest field now more accurately parses ** and **nil.
• The equality operators are now properly parsed as non-associative.

Changed

• BREAKING: Many fields have changed positions within their nodes. This impacts the C API and the Ruby API if you are manually creating nodes through the initializer.
• BREAKING: Almost all of the error messages have been updated to begin with lowercase characters to match ruby/spec.
• Unterminated strings with only plain content are now always StringNode as opposed to InterpolatedStringNode
• BREAKING: Call node has been split up when it is in the target position into CallTargetNode and IndexTargetNode.