racket/typed-racket

tooltips missing sometimes

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#667 opened on Feb 16, 2018

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enhancementgood first issue

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Description

In DrRacket, this program:

#lang typed/racket #:no-optimize

(: plus (-> (U String Integer)
            (U String Integer)
            (U String Integer)))
(define (plus x y)
  (cond
    [(and (number? x) (number? y))
     (+ x y)]
    [(number? x)
     (string-append
      (format "~a" x)
      (format "~a" y))]
    [(string? x)
     (string-append
      (format "~a" x)
      (format "~a" y))]
    [else
     (+ x (car x))]))

shows no tooltips in the (+ x (car x)) bit. It would be nice to show something about what's going on (not just silence).

Contributor guide

Research direction
Trace the code path in Typed Racket that generates tooltips for type errors, focusing on the 'else' branch of the cond expression and the use of 'car' on a non list.
Tech stack
None
Domain
developer experience
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
RacketGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60