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 留言) (0 反應) (1 負責人)Scala (1,159 fork)batch import

help wanteditype:enhancementstat:needs spec

倉庫指標

Star: (6,247 star)
PR 合併指標: (平均合併 18天 14小時) (30 天內合併 133 個 PR)

描述

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:

貢獻者指南

研究方向: 研究 Scala 3 REPL 如何解析並顯示非 Scala 類的方法簽章，重點關注運算符名稱到 JVM 位元組碼名稱的轉換（例如 + 到 $plus）。查看 ReplDriver.displayMembers 和 Rendering.renderVal 以了解方法符號的獲取和調用過程。
技術棧: kotlinjava
領域: clideveloper experience
議題類型: 錯誤
難度: 3
預計時間: 半天
活動狀態: 活躍
清晰度: 清晰
前置要求: ScalaJVM
新手友善度: 65

倉庫指標

描述

貢獻者指南

每天在信箱收到新鮮 Easy issues。