scala/scala3

NoSuchMethodError calling operator names from non-scala classes

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#4,534 opened on May 15, 2018

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 (7 comments) (0 reactions) (1 assignee)Scala (6,247 stars) (1,159 forks)batch import
help wanteditype:enhancementstat:needs spec

Description

Here's a Kotlin class:

class C {
  fun `+`() = 10
}

When I use it in repl, the completion can suggest the + method:

However, problems occur when calling:

Contributor guide

Tech stack
scalakotlin
Domain
clibackend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Scala 3 REPL usageJVM interop concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25
Research direction
Investigate how the Scala 3 REPL resolves methods from non Scala classes, particularly operator names like `+` that are mangled to `$plus`. The error occurs in ReplDriver.scala and Rendering.scala during displayMembers and displayDefinitions. Compare with Scala 2's handling and check if the issue is in the backend or the REPL's method resolution. Review the JVM method lookup for mangled names from Kotlin classes.