NoSuchMethodError calling operator names from non-scala classes · scala/scala3#4534

2018-05-15T15:36:36.000Z

Here's a Kotlin class: ```kotlin class C { fun `+`() = 10 } ``` When I use it in repl, the completion can suggest the `+` method: scala> val c = new C val c : C = C@1bc425e7 scala> c. eq isInstanceOf hashCode == getClass != equals ne + toString wait notify ## synchronized notifyAll asInstanceOf However, problems occur when calling: scala> c.+ java.lang. NoSuchMethodError: C .$plus()I at rs$line$2$.<init>(rs$line$2: 1 ) at rs$line$2$.<clinit>(rs$line$2) at rs$line$2.res0Show(rs$line$2) at sun.reflect. NativeMethodAccessorImpl .invoke0( Native Method ) at sun.reflect. NativeMethodAccessorImpl .invoke( NativeMethodAccessorImpl .java: 62 ) at sun.reflect. DelegatingMethodAccessorImpl .invoke( DelegatingMethodAccessorImpl .java: 43 ) at java.lang.reflect. Method .invoke( Method .java: 498 ) at dotty.tools.repl. Rendering .valueOf( Rendering .scala: 58 ) at dotty.tools.repl. Rendering .renderVal( Rendering .scala: 79 ) at dotty.tools.repl. ReplDriver .displayMembers$ 3 $$anonfun$ 3 (ReplDriver.scala: 284 ) at scala.collection. TraversableLike .$anonfun$map$ 1 (TraversableLike.scala: 234 ) at scala.collection.mutable. ResizableArray .foreach( ResizableArray .scala: 59 ) at scala.collection.mutable. ResizableArray .foreach$( ResizableArray .scala: 52 ) at scala.collection.mutable. ArrayBuffer .foreach( ArrayBuffer .scala: 48 ) at scala.collection. TraversableLike .map( TraversableLike .scala: 234 ) at scala.collection. TraversableLike .map$( TraversableLike .scala: 227 ) at scala.collection. AbstractTraversable .map( Traversable .scala: 104 ) at dotty.tools.repl. ReplDriver .displayMembers$ 7 (ReplDriver.scala: 284 ) at dotty.tools.repl. ReplDriver .displayDefinitions$$anonfun$ 3 $$anonfun$ 2 (ReplDriver.scala: 311 ) at scala. Option .map( Option .scala: 146 ) at dotty.tools.repl. ReplDriver .displayDefinitions$$anonfun$ 1 (ReplDriver.scala: 311 ) at dotty.tools.dotc.core. Periods .atPhase( Periods .scala: 26 ) at dotty.tools.dotc.core. Phases .atPhase( Phases .scala: 36 ) at dotty.tools.repl. ReplDriver .displayDefinitions( ReplDriver .scala: 316 ) at dotty.tools.repl. ReplDriver .compile$$anonfun$ 2 (ReplDriver.scala: 241 ) at scala.util. Either .fold( Either .scala: 188 ) at dotty.tools.repl. ReplDriver .compile( ReplDriver .scala: 242 ) at dotty.tools.repl. ReplDriver .interpret( ReplDriver .scala: 202 ) at dotty.tools.repl. ReplDriver .loop$ 1 (ReplDriver.scala: 150 ) at dotty.tools.repl. ReplDriver .runUntilQuit$$anonfun$ 1 (ReplDriver.scala: 154 ) at dotty.tools.repl. ReplDriver .withRedirectedOutput$$anonfun$ 2 $$anonfun$ 1 (ReplDriver.scala: 163 ) at scala.util. DynamicVariable .withValue( DynamicVariable .scala: 58 ) at scala. Console$ .withErr( Console .scala: 192 ) at dotty.tools.repl. ReplDriver .withRedirectedOutput$$anonfun$ 1 (ReplDriver.scala: 163 ) at scala.util. DynamicVariable .withValue( DynamicVariable .scala: 58 ) at scala. Console$ .withOut( Console .scala: 163 ) at dotty.tools.repl. ReplDriver .withRedirectedOutput( ReplDriver .scala: 163 ) at dotty.tools.repl. ReplDriver .runUntilQuit( ReplDriver .scala: 154 ) at dotty.tools.repl. Main$ .main( Main .scala: 6 ) at dotty.tools.repl. Main .main( Main .scala) scala> c.`+` java.lang. NoSuchMethodError: C .$plus()I at rs$line$3$.<init>(rs$line$3: 1 ) at rs$line$3$.<clinit>(rs$line$3) at rs$line$3.res1Show(rs$line$3) at sun.reflect. NativeMethodAccessorImpl .invoke0( Native Method ) at sun.reflect. NativeMethodAccessorImpl .invoke( NativeMethodAccessorImpl .java: 62 ) at sun.reflect. DelegatingMethodAccessorImpl .invoke( DelegatingMethodAccessorImpl .java: 43 ) at java.lang.reflect. Method .invoke( Method .java: 498 ) at dotty.tools.repl. Rendering .valueOf( Rendering .scala: 58 ) at dotty.tools.repl. Rendering .renderVal( Rendering .scala: 79 ) at dotty.tools.repl. ReplDriver .displayMembers$ 3 $$anonfun$ 3 (ReplDriver.scala: 284 ) at scala.collection. TraversableLike .$anonfun$map$ 1 (TraversableLike.scala: 234 ) at scala.collection.mutable. ResizableArray .foreach( ResizableArray .scala: 59 ) at scala.collection.mutable. ResizableArray .foreach$( ResizableArray .scala: 52 ) at scala.collection.mutable. ArrayBuffer .foreach( ArrayBuffer .scala: 48 ) at scala.collection. TraversableLike .map( TraversableLike .scala: 234 ) at scala.collection. TraversableLike .map$( TraversableLike .scala: 227 ) at scala.collection. AbstractTraversable .map( Traversable .scala: 104 ) at dotty.tools.repl. ReplDriver .displayMembers$ 7 (ReplDriver.scala: 284 ) at dotty.tools.repl. ReplDriver .displayDefinitions$$anonfun$ 3 $$anonfun$ 2 (ReplDriver.scala: 311 ) at scala. Option .map( Option .scala: 146 ) at dotty.tools.repl. ReplDriver .displayDefinitions$$anonfun$ 1 (ReplDriver.scala: 311 ) at dotty.tools.dotc.core. Periods .atPhase( Periods .scala: 26 ) at dotty.tools.dotc.core. Phases .atPhase( Phases .scala: 36 ) at dotty.tools.repl. ReplDriver .displayDefinitions( ReplDriver .scala: 316 ) at dotty.tools.repl. ReplDriver .compile$$anonfun$ 2 (ReplDriver.scala: 241 ) at scala.util. Either .fold( Either .scala: 188 ) at dotty.tools.repl. ReplDriver .compile( ReplDriver .scala: 242 ) at dotty.tools.repl. ReplDriver .interpret( ReplDriver .scala: 202 ) at dotty.tools.repl. ReplDriver .loop$ 1 (ReplDriver.scala: 150 ) at dotty.tools.repl. ReplDriver .runUntilQuit$$anonfun$ 1 (ReplDriver.scala: 154 ) at dotty.tools.repl. ReplDriver .withRedirectedOutput$$anonfun$ 2 $$anonfun$ 1 (ReplDriver.scala: 163 ) at scala.util. DynamicVariable .withValue( DynamicVariable .scala: 58 ) at scala. Console$ .withErr( Console .scala: 192 ) at dotty.tools.repl. ReplDriver .withRedirectedOutput$$anonfun$ 1 (ReplDriver.scala: 163 ) at scala.util. DynamicVariable .withValue( DynamicVariable .scala: 58 ) at scala. Console$ .withOut( Console .scala: 163 ) at dotty.tools.repl. ReplDriver .withRedirectedOutput( ReplDriver .scala: 163 ) at dotty.tools.repl. ReplDriver .runUntilQuit( ReplDriver .scala: 154 ) at dotty.tools.repl. Main$ .main( Main .scala: 6 ) at dotty.tools.repl. Main .main( Main .scala)

(7 comments) (0 reactions) (1 assignee)Scala (1,159 forks)batch import

help wanteditype:enhancementstat:needs spec

Repository metrics

Stars: (6,247 stars)
PR merge metrics: (平均マージ 18d 14h) (30d で 133 merged PRs)

説明

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:

コントリビューターガイド

調査方針: Scala 3 REPL が非 Scala クラスのメソッドシグネチャをどのように解決して表示するかを調査し、演算子名の JVM バイトコード名への変換（例: + から $plus）に焦点を当ててください。ReplDriver.displayMembers と Rendering.renderVal を調べて、メソッドシンボルの取得と呼び出し方法を理解してください。
技術スタック: kotlinjava
領域: clideveloper experience
Issue 種別: バグ
難度: 3
推定時間: 半日
活動状況: アクティブ
明確さ: 明確
前提条件: ScalaJVM
初心者向け度: 65

Repository metrics

説明

コントリビューターガイド

新着 Easy issues をメールで受け取る。