Add safety checks to samMethod

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

@@ -853,8 +853,14 @@ class DottyBackendInterface(outputDirectory: AbstractFile, val superCallsMap: Ma
 
     def addRemoteRemoteExceptionAnnotation: Unit = ()
 
-    def samMethod(): Symbol =
-      toDenot(sym).info.abstractTermMembers.headOption.getOrElse(toDenot(sym).info.member(nme.apply)).symbol
+    def samMethod(): Symbol = ctx.atPhase(ctx.erasurePhase) { implicit ctx =>
+      toDenot(sym).info.abstractTermMembers.toList match {
+        case x :: Nil => x.symbol
+        case Nil => abort(s"${sym.show} is not a functional interface. It doesn't have abstract methods")
+        case xs => abort(s"${sym.show} is not a functional interface. " +
+          s"It has the following abstract methods: ${xs.map(_.name).mkString(", ")}")
+      }
+    }
 
     def isFunctionClass: Boolean =
       defn.isFunctionClass(sym)

library/src/dotty/runtime/function/JFunction1$mcDD$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcDD$sp extends JFunction1 {
+public interface JFunction1$mcDD$sp extends JFunction1<Object, Object> {
     abstract double apply$mcDD$sp(double v1);
 
     default Object apply(Object t) { return (Double) apply$mcDD$sp(scala.runtime.BoxesRunTime.unboxToDouble(t)); }

library/src/dotty/runtime/function/JFunction1$mcDF$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcDF$sp extends JFunction1 {
+public interface JFunction1$mcDF$sp extends JFunction1<Object, Object> {
     abstract double apply$mcDF$sp(float v1);
 
     default Object apply(Object t) { return (Double) apply$mcDF$sp(scala.runtime.BoxesRunTime.unboxToFloat(t)); }

library/src/dotty/runtime/function/JFunction1$mcDI$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcDI$sp extends JFunction1 {
+public interface JFunction1$mcDI$sp extends JFunction1<Object, Object> {
     abstract double apply$mcDI$sp(int v1);
 
     default Object apply(Object t) { return (Double) apply$mcDI$sp(scala.runtime.BoxesRunTime.unboxToInt(t)); }

library/src/dotty/runtime/function/JFunction1$mcDJ$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcDJ$sp extends JFunction1 {
+public interface JFunction1$mcDJ$sp extends JFunction1<Object, Object> {
     abstract double apply$mcDJ$sp(long v1);
 
     default Object apply(Object t) { return (Double) apply$mcDJ$sp(scala.runtime.BoxesRunTime.unboxToLong(t)); }

library/src/dotty/runtime/function/JFunction1$mcFD$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcFD$sp extends JFunction1 {
+public interface JFunction1$mcFD$sp extends JFunction1<Object, Object> {
     abstract float apply$mcFD$sp(double v1);
 
     default Object apply(Object t) { return (Float) apply$mcFD$sp(scala.runtime.BoxesRunTime.unboxToDouble(t)); }

library/src/dotty/runtime/function/JFunction1$mcFF$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcFF$sp extends JFunction1 {
+public interface JFunction1$mcFF$sp extends JFunction1<Object, Object> {
     abstract float apply$mcFF$sp(float v1);
 
     default Object apply(Object t) { return (Float) apply$mcFF$sp(scala.runtime.BoxesRunTime.unboxToFloat(t)); }

library/src/dotty/runtime/function/JFunction1$mcFI$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcFI$sp extends JFunction1 {
+public interface JFunction1$mcFI$sp extends JFunction1<Object, Object> {
     abstract float apply$mcFI$sp(int v1);
 
     default Object apply(Object t) { return (Float) apply$mcFI$sp(scala.runtime.BoxesRunTime.unboxToInt(t)); }

library/src/dotty/runtime/function/JFunction1$mcFJ$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcFJ$sp extends JFunction1 {
+public interface JFunction1$mcFJ$sp extends JFunction1<Object, Object> {
     abstract float apply$mcFJ$sp(long v1);
 
     default Object apply(Object t) { return (Float) apply$mcFJ$sp(scala.runtime.BoxesRunTime.unboxToLong(t)); }

library/src/dotty/runtime/function/JFunction1$mcID$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcID$sp extends JFunction1 {
+public interface JFunction1$mcID$sp extends JFunction1<Object, Object> {
     abstract int apply$mcID$sp(double v1);
 
     default Object apply(Object t) { return (Integer) apply$mcID$sp(scala.runtime.BoxesRunTime.unboxToDouble(t)); }

library/src/dotty/runtime/function/JFunction1$mcIF$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcIF$sp extends JFunction1 {
+public interface JFunction1$mcIF$sp extends JFunction1<Object, Object> {
     abstract int apply$mcIF$sp(float v1);
 
     default Object apply(Object t) { return (Integer) apply$mcIF$sp(scala.runtime.BoxesRunTime.unboxToFloat(t)); }

library/src/dotty/runtime/function/JFunction1$mcII$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcII$sp extends JFunction1 {
+public interface JFunction1$mcII$sp extends JFunction1<Object, Object> {
     abstract int apply$mcII$sp(int v1);
 
     default Object apply(Object t) { return (Integer) apply$mcII$sp(scala.runtime.BoxesRunTime.unboxToInt(t)); }

library/src/dotty/runtime/function/JFunction1$mcIJ$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcIJ$sp extends JFunction1 {
+public interface JFunction1$mcIJ$sp extends JFunction1<Object, Object> {
     abstract int apply$mcIJ$sp(long v1);
 
     default Object apply(Object t) { return (Integer) apply$mcIJ$sp(scala.runtime.BoxesRunTime.unboxToLong(t)); }

library/src/dotty/runtime/function/JFunction1$mcJD$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcJD$sp extends JFunction1 {
+public interface JFunction1$mcJD$sp extends JFunction1<Object, Object> {
     abstract long apply$mcJD$sp(double v1);
 
     default Object apply(Object t) { return (Long) apply$mcJD$sp(scala.runtime.BoxesRunTime.unboxToDouble(t)); }

library/src/dotty/runtime/function/JFunction1$mcJF$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcJF$sp extends JFunction1 {
+public interface JFunction1$mcJF$sp extends JFunction1<Object, Object> {
     abstract long apply$mcJF$sp(float v1);
 
     default Object apply(Object t) { return (Long) apply$mcJF$sp(scala.runtime.BoxesRunTime.unboxToFloat(t)); }

library/src/dotty/runtime/function/JFunction1$mcJI$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcJI$sp extends JFunction1 {
+public interface JFunction1$mcJI$sp extends JFunction1<Object, Object> {
     abstract long apply$mcJI$sp(int v1);
 
     default Object apply(Object t) { return (Long) apply$mcJI$sp(scala.runtime.BoxesRunTime.unboxToInt(t)); }

library/src/dotty/runtime/function/JFunction1$mcJJ$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcJJ$sp extends JFunction1 {
+public interface JFunction1$mcJJ$sp extends JFunction1<Object, Object> {
     abstract long apply$mcJJ$sp(long v1);
 
     default Object apply(Object t) { return (Long) apply$mcJJ$sp(scala.runtime.BoxesRunTime.unboxToLong(t)); }

library/src/dotty/runtime/function/JFunction1$mcVD$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcVD$sp extends JFunction1 {
+public interface JFunction1$mcVD$sp extends JFunction1<Object, Object> {
     abstract void apply$mcVD$sp(double v1);
 
     default Object apply(Object t) { apply$mcVD$sp(scala.runtime.BoxesRunTime.unboxToDouble(t)); return scala.runtime.BoxedUnit.UNIT; }

library/src/dotty/runtime/function/JFunction1$mcVF$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcVF$sp extends JFunction1 {
+public interface JFunction1$mcVF$sp extends JFunction1<Object, Object> {
     abstract void apply$mcVF$sp(float v1);
 
     default Object apply(Object t) { apply$mcVF$sp(scala.runtime.BoxesRunTime.unboxToFloat(t)); return scala.runtime.BoxedUnit.UNIT; }

library/src/dotty/runtime/function/JFunction1$mcVI$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcVI$sp extends JFunction1 {
+public interface JFunction1$mcVI$sp extends JFunction1<Object, Object> {
     abstract void apply$mcVI$sp(int v1);
 
     default Object apply(Object t) { apply$mcVI$sp(scala.runtime.BoxesRunTime.unboxToInt(t)); return scala.runtime.BoxedUnit.UNIT; }

library/src/dotty/runtime/function/JFunction1$mcVJ$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcVJ$sp extends JFunction1 {
+public interface JFunction1$mcVJ$sp extends JFunction1<Object, Object> {
     abstract void apply$mcVJ$sp(long v1);
 
     default Object apply(Object t) { apply$mcVJ$sp(scala.runtime.BoxesRunTime.unboxToLong(t)); return scala.runtime.BoxedUnit.UNIT; }

library/src/dotty/runtime/function/JFunction1$mcZD$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcZD$sp extends JFunction1 {
+public interface JFunction1$mcZD$sp extends JFunction1<Object, Object> {
     abstract boolean apply$mcZD$sp(double v1);
 
     default Object apply(Object t) { return (Boolean) apply$mcZD$sp(scala.runtime.BoxesRunTime.unboxToDouble(t)); }

library/src/dotty/runtime/function/JFunction1$mcZF$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcZF$sp extends JFunction1 {
+public interface JFunction1$mcZF$sp extends JFunction1<Object, Object> {
     abstract boolean apply$mcZF$sp(float v1);
 
     default Object apply(Object t) { return (Boolean) apply$mcZF$sp(scala.runtime.BoxesRunTime.unboxToFloat(t)); }

library/src/dotty/runtime/function/JFunction1$mcZI$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcZI$sp extends JFunction1 {
+public interface JFunction1$mcZI$sp extends JFunction1<Object, Object> {
     abstract boolean apply$mcZI$sp(int v1);
 
     default Object apply(Object t) { return (Boolean) apply$mcZI$sp(scala.runtime.BoxesRunTime.unboxToInt(t)); }

library/src/dotty/runtime/function/JFunction1$mcZJ$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction1$mcZJ$sp extends JFunction1 {
+public interface JFunction1$mcZJ$sp extends JFunction1<Object, Object> {
     abstract boolean apply$mcZJ$sp(long v1);
 
     default Object apply(Object t) { return (Boolean) apply$mcZJ$sp(scala.runtime.BoxesRunTime.unboxToLong(t)); }

library/src/dotty/runtime/function/JFunction2$mcDDD$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcDDD$sp extends JFunction2 {
+public interface JFunction2$mcDDD$sp extends JFunction2<Object, Object, Object> {
     abstract double apply$mcDDD$sp(double v1, double v2);
 
     default Object apply(Object v1, Object v2) { return (Double) apply$mcDDD$sp(scala.runtime.BoxesRunTime.unboxToDouble(v1), scala.runtime.BoxesRunTime.unboxToDouble(v2)); }

library/src/dotty/runtime/function/JFunction2$mcDDI$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcDDI$sp extends JFunction2 {
+public interface JFunction2$mcDDI$sp extends JFunction2<Object, Object, Object> {
     abstract double apply$mcDDI$sp(double v1, int v2);
 
     default Object apply(Object v1, Object v2) { return (Double) apply$mcDDI$sp(scala.runtime.BoxesRunTime.unboxToDouble(v1), scala.runtime.BoxesRunTime.unboxToInt(v2)); }

library/src/dotty/runtime/function/JFunction2$mcDDJ$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcDDJ$sp extends JFunction2 {
+public interface JFunction2$mcDDJ$sp extends JFunction2<Object, Object, Object> {
     abstract double apply$mcDDJ$sp(double v1, long v2);
 
     default Object apply(Object v1, Object v2) { return (Double) apply$mcDDJ$sp(scala.runtime.BoxesRunTime.unboxToDouble(v1), scala.runtime.BoxesRunTime.unboxToLong(v2)); }

library/src/dotty/runtime/function/JFunction2$mcDID$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcDID$sp extends JFunction2 {
+public interface JFunction2$mcDID$sp extends JFunction2<Object, Object, Object> {
     abstract double apply$mcDID$sp(int v1, double v2);
 
     default Object apply(Object v1, Object v2) { return (Double) apply$mcDID$sp(scala.runtime.BoxesRunTime.unboxToInt(v1), scala.runtime.BoxesRunTime.unboxToDouble(v2)); }

library/src/dotty/runtime/function/JFunction2$mcDII$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcDII$sp extends JFunction2 {
+public interface JFunction2$mcDII$sp extends JFunction2<Object, Object, Object> {
     abstract double apply$mcDII$sp(int v1, int v2);
 
     default Object apply(Object v1, Object v2) { return (Double) apply$mcDII$sp(scala.runtime.BoxesRunTime.unboxToInt(v1), scala.runtime.BoxesRunTime.unboxToInt(v2)); }

library/src/dotty/runtime/function/JFunction2$mcDIJ$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcDIJ$sp extends JFunction2 {
+public interface JFunction2$mcDIJ$sp extends JFunction2<Object, Object, Object> {
     abstract double apply$mcDIJ$sp(int v1, long v2);
 
     default Object apply(Object v1, Object v2) { return (Double) apply$mcDIJ$sp(scala.runtime.BoxesRunTime.unboxToInt(v1), scala.runtime.BoxesRunTime.unboxToLong(v2)); }

library/src/dotty/runtime/function/JFunction2$mcDJD$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcDJD$sp extends JFunction2 {
+public interface JFunction2$mcDJD$sp extends JFunction2<Object, Object, Object> {
     abstract double apply$mcDJD$sp(long v1, double v2);
 
     default Object apply(Object v1, Object v2) { return (Double) apply$mcDJD$sp(scala.runtime.BoxesRunTime.unboxToLong(v1), scala.runtime.BoxesRunTime.unboxToDouble(v2)); }

library/src/dotty/runtime/function/JFunction2$mcDJI$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcDJI$sp extends JFunction2 {
+public interface JFunction2$mcDJI$sp extends JFunction2<Object, Object, Object> {
     abstract double apply$mcDJI$sp(long v1, int v2);
 
     default Object apply(Object v1, Object v2) { return (Double) apply$mcDJI$sp(scala.runtime.BoxesRunTime.unboxToLong(v1), scala.runtime.BoxesRunTime.unboxToInt(v2)); }

library/src/dotty/runtime/function/JFunction2$mcDJJ$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcDJJ$sp extends JFunction2 {
+public interface JFunction2$mcDJJ$sp extends JFunction2<Object, Object, Object> {
     abstract double apply$mcDJJ$sp(long v1, long v2);
 
     default Object apply(Object v1, Object v2) { return (Double) apply$mcDJJ$sp(scala.runtime.BoxesRunTime.unboxToLong(v1), scala.runtime.BoxesRunTime.unboxToLong(v2)); }

library/src/dotty/runtime/function/JFunction2$mcFDD$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcFDD$sp extends JFunction2 {
+public interface JFunction2$mcFDD$sp extends JFunction2<Object, Object, Object> {
     abstract float apply$mcFDD$sp(double v1, double v2);
 
     default Object apply(Object v1, Object v2) { return (Float) apply$mcFDD$sp(scala.runtime.BoxesRunTime.unboxToDouble(v1), scala.runtime.BoxesRunTime.unboxToDouble(v2)); }

library/src/dotty/runtime/function/JFunction2$mcFDI$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcFDI$sp extends JFunction2 {
+public interface JFunction2$mcFDI$sp extends JFunction2<Object, Object, Object> {
     abstract float apply$mcFDI$sp(double v1, int v2);
 
     default Object apply(Object v1, Object v2) { return (Float) apply$mcFDI$sp(scala.runtime.BoxesRunTime.unboxToDouble(v1), scala.runtime.BoxesRunTime.unboxToInt(v2)); }

library/src/dotty/runtime/function/JFunction2$mcFDJ$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcFDJ$sp extends JFunction2 {
+public interface JFunction2$mcFDJ$sp extends JFunction2<Object, Object, Object> {
     abstract float apply$mcFDJ$sp(double v1, long v2);
 
     default Object apply(Object v1, Object v2) { return (Float) apply$mcFDJ$sp(scala.runtime.BoxesRunTime.unboxToDouble(v1), scala.runtime.BoxesRunTime.unboxToLong(v2)); }

library/src/dotty/runtime/function/JFunction2$mcFID$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcFID$sp extends JFunction2 {
+public interface JFunction2$mcFID$sp extends JFunction2<Object, Object, Object> {
     abstract float apply$mcFID$sp(int v1, double v2);
 
     default Object apply(Object v1, Object v2) { return (Float) apply$mcFID$sp(scala.runtime.BoxesRunTime.unboxToInt(v1), scala.runtime.BoxesRunTime.unboxToDouble(v2)); }

library/src/dotty/runtime/function/JFunction2$mcFII$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcFII$sp extends JFunction2 {
+public interface JFunction2$mcFII$sp extends JFunction2<Object, Object, Object> {
     abstract float apply$mcFII$sp(int v1, int v2);
 
     default Object apply(Object v1, Object v2) { return (Float) apply$mcFII$sp(scala.runtime.BoxesRunTime.unboxToInt(v1), scala.runtime.BoxesRunTime.unboxToInt(v2)); }

library/src/dotty/runtime/function/JFunction2$mcFIJ$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcFIJ$sp extends JFunction2 {
+public interface JFunction2$mcFIJ$sp extends JFunction2<Object, Object, Object> {
     abstract float apply$mcFIJ$sp(int v1, long v2);
 
     default Object apply(Object v1, Object v2) { return (Float) apply$mcFIJ$sp(scala.runtime.BoxesRunTime.unboxToInt(v1), scala.runtime.BoxesRunTime.unboxToLong(v2)); }

library/src/dotty/runtime/function/JFunction2$mcFJD$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcFJD$sp extends JFunction2 {
+public interface JFunction2$mcFJD$sp extends JFunction2<Object, Object, Object> {
     abstract float apply$mcFJD$sp(long v1, double v2);
 
     default Object apply(Object v1, Object v2) { return (Float) apply$mcFJD$sp(scala.runtime.BoxesRunTime.unboxToLong(v1), scala.runtime.BoxesRunTime.unboxToDouble(v2)); }

library/src/dotty/runtime/function/JFunction2$mcFJI$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcFJI$sp extends JFunction2 {
+public interface JFunction2$mcFJI$sp extends JFunction2<Object, Object, Object> {
     abstract float apply$mcFJI$sp(long v1, int v2);
 
     default Object apply(Object v1, Object v2) { return (Float) apply$mcFJI$sp(scala.runtime.BoxesRunTime.unboxToLong(v1), scala.runtime.BoxesRunTime.unboxToInt(v2)); }

library/src/dotty/runtime/function/JFunction2$mcFJJ$sp.java

@@ -6,7 +6,7 @@
 package dotty.runtime.function;
 
 @FunctionalInterface
-public interface JFunction2$mcFJJ$sp extends JFunction2 {
+public interface JFunction2$mcFJJ$sp extends JFunction2<Object, Object, Object> {
     abstract float apply$mcFJJ$sp(long v1, long v2);
 
     default Object apply(Object v1, Object v2) { return (Float) apply$mcFJJ$sp(scala.runtime.BoxesRunTime.unboxToLong(v1), scala.runtime.BoxesRunTime.unboxToLong(v2)); }