reasonml / reasonml/reason

[refmt]: Operators precedence is not respected on line breaks

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KIND: BUG Parser
Dominant language
OCaml
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Description

/* Actual */
let isWithinWithOffset = (point: Point.t, rect: Rect.t, offset: Offset.t) =>
  point.x >= rect.left
  - offset.left
  && point.x <= rect.right
  + offset.right
  && point.y >= rect.top
  - offset.top
  && point.y <= rect.bottom
  + offset.bottom;

/* Expected */
let isWithinWithOffset = (point: Point.t, rect: Rect.t, offset: Offset.t) =>
  point.x >= rect.left - offset.left
  && point.x <= rect.right + offset.right
  && point.y >= rect.top - offset.top
  && point.y <= rect.bottom + offset.bottom;

If I try to prevent line break by wrapping (rect.left - offset.left), refmt removes ().

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the supplied Reason example with refmt and locate the formatting logic that handles operator precedence across line breaks. Compare the actual and expected output, including the behavior when parentheses are added; done means refmt preserves the intended arithmetic grouping and produces the expected formatting.

Written by the indexing model from the issue text.

Assessment

Tech stack
ocaml
Domain
tooling
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
42/100

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