Gedochao
commented
3 days ago scala-cli compile --script-snippet '(new Function[(Int, Int), Int] {def apply(a: Int, b: Int): Int = a * b})(2, 3)'Here's the output when compiled outside of the REPL:
```scala
-- Error: /var/folders/5n/_ggj7kk93czdt_n0jzrk8s780000gn/T/14507058402592798626/.scala-build/14507058402592798626_22f9a8571a-571f19b3f1/src_generated/main/snippet.scala:7:1
7 |(new Function[(Int, Int), Int] {def apply(a: Int, b: Int): Int = a * b})(2, 3)
| ^
|object creation impossible, since def apply(v1: T1): R in trait Function1 in package scala is not defined
unhandled exception while running MegaPhase{crossVersionChecks, firstTransform, checkReentrant, elimPackagePrefixes, cookComments, checkLoopingImplicits, betaReduce, inlineVals, expandSAMs, elimRepeated, refchecks} on /var/folders/5n/_ggj7kk93czdt_n0jzrk8s780000gn/T/14507058402592798626/.scala-build/14507058402592798626_22f9a8571a-571f19b3f1/src_generated/main/snippet.scala
An unhandled exception was thrown in the compiler.
Please file a crash report here:
https://github.com/scala/scala3/issues/new/choose
For non-enriched exceptions, compile with -Xno-enrich-error-messages.
while compiling: /var/folders/5n/_ggj7kk93czdt_n0jzrk8s780000gn/T/14507058402592798626/.scala-build/14507058402592798626_22f9a8571a-571f19b3f1/src_generated/main/snippet.scala
during phase: MegaPhase{crossVersionChecks, firstTransform, checkReentrant, elimPackagePrefixes, cookComments, checkLoopingImplicits, betaReduce, inlineVals, expandSAMs, elimRepeated, refchecks}
mode: Mode(ImplicitsEnabled)
library version: version 2.13.14
compiler version: version 3.5.1
settings: -classpath /Users/pchabelski/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala3-library_3/3.5.1/scala3-library_3-3.5.1.jar:/Users/pchabelski/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.14/scala-library-2.13.14.jar -d /var/folders/5n/_ggj7kk93czdt_n0jzrk8s780000gn/T/14507058402592798626/.scala-build/14507058402592798626_22f9a8571a-571f19b3f1/classes/main -explain true -sourceroot /var/folders/5n/_ggj7kk93czdt_n0jzrk8s780000gn/T/14507058402592798626
Exception in thread "main" java.lang.UnsupportedOperationException: tail of empty list
at scala.collection.immutable.Nil$.tail(List.scala:665)
at scala.collection.immutable.Nil$.tail(List.scala:662)
at dotty.tools.dotc.core.Substituters$.substSym(Substituters.scala:87)
at dotty.tools.dotc.core.Types$Type.substSym(Types.scala:1941)
at dotty.tools.dotc.ast.TreeTypeMap$$anon$2.apply(TreeTypeMap.scala:75)
at dotty.tools.dotc.ast.TreeTypeMap.mapType(TreeTypeMap.scala:76)
at dotty.tools.dotc.ast.TreeTypeMap.transform(TreeTypeMap.scala:110)
at dotty.tools.dotc.transform.BetaReduce$.reduceApplication(BetaReduce.scala:151)
at dotty.tools.dotc.transform.BetaReduce$.recur$1(BetaReduce.scala:82)
at dotty.tools.dotc.transform.BetaReduce$.apply(BetaReduce.scala:95)
at dotty.tools.dotc.transform.BetaReduce.transformApply(BetaReduce.scala:44)
at dotty.tools.dotc.transform.MegaPhase.goApply(MegaPhase.scala:681)
at dotty.tools.dotc.transform.MegaPhase.goApply(MegaPhase.scala:682)
at dotty.tools.dotc.transform.MegaPhase.transformUnnamed$1(MegaPhase.scala:297)
at dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:454)
at dotty.tools.dotc.transform.MegaPhase.loop$1(MegaPhase.scala:465)
at dotty.tools.dotc.transform.MegaPhase.transformStats(MegaPhase.scala:465)
at dotty.tools.dotc.transform.MegaPhase.transformUnnamed$1(MegaPhase.scala:376)
at dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:454)
at dotty.tools.dotc.transform.MegaPhase.transformNamed$1(MegaPhase.scala:272)
at dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:452)
at dotty.tools.dotc.transform.MegaPhase.loop$1(MegaPhase.scala:465)
at dotty.tools.dotc.transform.MegaPhase.transformStats(MegaPhase.scala:465)
at dotty.tools.dotc.transform.MegaPhase.mapPackage$1(MegaPhase.scala:396)
at dotty.tools.dotc.transform.MegaPhase.transformUnnamed$1(MegaPhase.scala:399)
at dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:454)
at dotty.tools.dotc.transform.MegaPhase.transformUnit(MegaPhase.scala:481)
at dotty.tools.dotc.transform.MegaPhase.run(MegaPhase.scala:493)
at dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:380)
at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
at scala.collection.immutable.List.foreach(List.scala:334)
at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:373)
at dotty.tools.dotc.Run.runPhases$1$$anonfun$1(Run.scala:343)
at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
at dotty.tools.dotc.Run.runPhases$1(Run.scala:336)
at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:384)
at dotty.tools.dotc.Run.compileUnits$$anonfun$adapted$1(Run.scala:396)
at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:69)
at dotty.tools.dotc.Run.compileUnits(Run.scala:396)
at dotty.tools.dotc.Run.compileSources(Run.scala:282)
at dotty.tools.dotc.Run.compile(Run.scala:267)
at dotty.tools.dotc.Driver.doCompile(Driver.scala:37)
at dotty.tools.dotc.Driver.process(Driver.scala:201)
at dotty.tools.dotc.Driver.process(Driver.scala:169)
at dotty.tools.dotc.Driver.process(Driver.scala:181)
at dotty.tools.dotc.Driver.main(Driver.scala:211)
at dotty.tools.dotc.Main.main(Main.scala)
```
Compiler version
3.5.2
Minimized code
When running in scala-cli, the following crashes:
Of course, the above code is invalid, there should be a single tuple argument to
apply. The unexpected result is that Scala crashes altogether instead of just throwing an exception.It should be replaced with any of the following, which both work:
Output (click arrow to expand)
Note