Fix #6109: implement FunctionX.curried

compiler/src/dotty/tools/backend/jvm/DottyBackendInterface.scala

@@ -1178,7 +1178,8 @@ class DottyBackendInterface(outputDirectory: AbstractFile, val superCallsMap: Ma
         val returnsUnit = field.meth.tpe.widenDealias.resultType.classSymbol == UnitClass
         if (returnsUnit)
           ctx.requiredClass(("dotty.runtime.function.JProcedure" + arity))
-        else ctx.requiredClass(("dotty.runtime.function.JFunction" + arity))
+        else if (arity <= 2) ctx.requiredClass(("dotty.runtime.function.JFunction" + arity))
+        else ctx.requiredClass(("scala.Function" + arity))
       }
     }
   }

library/src/dotty/runtime/function/JProcedure10.java

@@ -8,7 +8,7 @@
 import scala.runtime.BoxedUnit;
 
 @FunctionalInterface
-public interface JProcedure10<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> extends JFunction10<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, BoxedUnit>, java.io.Serializable {
+public interface JProcedure10<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> extends scala.Function10<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, BoxedUnit>, java.io.Serializable {
     default void $init$() {
     }
 

library/src/dotty/runtime/function/JProcedure11.java

@@ -8,7 +8,7 @@
 import scala.runtime.BoxedUnit;
 
 @FunctionalInterface
-public interface JProcedure11<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> extends JFunction11<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, BoxedUnit>, java.io.Serializable {
+public interface JProcedure11<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> extends scala.Function11<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, BoxedUnit>, java.io.Serializable {
     default void $init$() {
     }
 

library/src/dotty/runtime/function/JProcedure12.java

@@ -8,7 +8,7 @@
 import scala.runtime.BoxedUnit;
 
 @FunctionalInterface
-public interface JProcedure12<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> extends JFunction12<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, BoxedUnit>, java.io.Serializable {
+public interface JProcedure12<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> extends scala.Function12<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, BoxedUnit>, java.io.Serializable {
     default void $init$() {
     }
 

library/src/dotty/runtime/function/JProcedure13.java

@@ -8,7 +8,7 @@
 import scala.runtime.BoxedUnit;
 
 @FunctionalInterface
-public interface JProcedure13<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13> extends JFunction13<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, BoxedUnit>, java.io.Serializable {
+public interface JProcedure13<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13> extends scala.Function13<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, BoxedUnit>, java.io.Serializable {
     default void $init$() {
     }
 

library/src/dotty/runtime/function/JProcedure14.java

@@ -8,7 +8,7 @@
 import scala.runtime.BoxedUnit;
 
 @FunctionalInterface
-public interface JProcedure14<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14> extends JFunction14<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, BoxedUnit>, java.io.Serializable {
+public interface JProcedure14<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14> extends scala.Function14<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, BoxedUnit>, java.io.Serializable {
     default void $init$() {
     }
 

library/src/dotty/runtime/function/JProcedure15.java

@@ -8,7 +8,7 @@
 import scala.runtime.BoxedUnit;
 
 @FunctionalInterface
-public interface JProcedure15<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15> extends JFunction15<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, BoxedUnit>, java.io.Serializable {
+public interface JProcedure15<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15> extends scala.Function15<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, BoxedUnit>, java.io.Serializable {
     default void $init$() {
     }
 

library/src/dotty/runtime/function/JProcedure16.java

@@ -8,7 +8,7 @@
 import scala.runtime.BoxedUnit;
 
 @FunctionalInterface
-public interface JProcedure16<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16> extends JFunction16<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, BoxedUnit>, java.io.Serializable {
+public interface JProcedure16<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16> extends scala.Function16<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, BoxedUnit>, java.io.Serializable {
     default void $init$() {
     }
 

library/src/dotty/runtime/function/JProcedure17.java

@@ -8,7 +8,7 @@
 import scala.runtime.BoxedUnit;
 
 @FunctionalInterface
-public interface JProcedure17<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17> extends JFunction17<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, BoxedUnit>, java.io.Serializable {
+public interface JProcedure17<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17> extends scala.Function17<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, BoxedUnit>, java.io.Serializable {
     default void $init$() {
     }
 

library/src/dotty/runtime/function/JProcedure18.java

@@ -8,7 +8,7 @@
 import scala.runtime.BoxedUnit;
 
 @FunctionalInterface
-public interface JProcedure18<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18> extends JFunction18<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, BoxedUnit>, java.io.Serializable {
+public interface JProcedure18<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18> extends scala.Function18<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, BoxedUnit>, java.io.Serializable {
     default void $init$() {
     }
 

library/src/dotty/runtime/function/JProcedure19.java

@@ -8,7 +8,7 @@
 import scala.runtime.BoxedUnit;
 
 @FunctionalInterface
-public interface JProcedure19<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19> extends JFunction19<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, BoxedUnit>, java.io.Serializable {
+public interface JProcedure19<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19> extends scala.Function19<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, BoxedUnit>, java.io.Serializable {
     default void $init$() {
     }
 

library/src/dotty/runtime/function/JProcedure20.java

@@ -8,7 +8,7 @@
 import scala.runtime.BoxedUnit;
 
 @FunctionalInterface
-public interface JProcedure20<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20> extends JFunction20<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, BoxedUnit>, java.io.Serializable {
+public interface JProcedure20<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20> extends scala.Function20<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, BoxedUnit>, java.io.Serializable {
     default void $init$() {
     }
 

library/src/dotty/runtime/function/JProcedure21.java

@@ -8,7 +8,7 @@
 import scala.runtime.BoxedUnit;
 
 @FunctionalInterface
-public interface JProcedure21<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21> extends JFunction21<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, BoxedUnit>, java.io.Serializable {
+public interface JProcedure21<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21> extends scala.Function21<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, BoxedUnit>, java.io.Serializable {
     default void $init$() {
     }