From 5ba129070f46da9b981d36afe2f9f0aac50c3800 Mon Sep 17 00:00:00 2001 From: Jason Zaugg Date: Thu, 26 Jun 2014 11:32:01 +0200 Subject: SI-8675 Add another test case for swallowed type errors As reported on scala-internals. After tightening up the treatment of undetermined type parameters in SI-7944, the enclosed test case no longer typechecks. And since the regression fixed in the previous commit, the error was swallowed by the typechecker only to be burped up by a crash in the backend. --- test/files/neg/t8675b.check | 6 ++++++ test/files/neg/t8675b.scala | 22 ++++++++++++++++++++++ 2 files changed, 28 insertions(+) create mode 100644 test/files/neg/t8675b.check create mode 100644 test/files/neg/t8675b.scala (limited to 'test') diff --git a/test/files/neg/t8675b.check b/test/files/neg/t8675b.check new file mode 100644 index 0000000000..cb7ac8af59 --- /dev/null +++ b/test/files/neg/t8675b.check @@ -0,0 +1,6 @@ +t8675b.scala:19: error: missing parameter type for expanded function +The argument types of an anonymous function must be fully known. (SLS 8.5) +Expected type was: List[Test.Reportable1[?,?]] => Boolean + for (path: List[Any] <- (null : Engine1).asRequirement.pathsIncludingSelf.toList) { + ^ +one error found diff --git a/test/files/neg/t8675b.scala b/test/files/neg/t8675b.scala new file mode 100644 index 0000000000..2c5015b1d0 --- /dev/null +++ b/test/files/neg/t8675b.scala @@ -0,0 +1,22 @@ +object Test { + trait Engine1 + + implicit class EngineTools1[Params, R](e: Engine1) { + def asRequirement: Requirement1[Params, R] = ??? + } + trait Requirement1[Params, R] { + def pathsIncludingSelf: Traversable[List[Reportable1[Params, R]]] + } + trait Reportable1[Params, R] + + // "missing paramater type" error was swallowed in 2.11.0 leading to a crash + // in the backend. + // + // This error is itself a regression (or at least a change) in 2.11.0-M7, + // specifically in SI-7944. The type paramaters to the implicit view + // `EngineTools1` are undetermined, and are now treated as type variables + // in the expected type of the closure argument to `withFilter`. + for (path: List[Any] <- (null : Engine1).asRequirement.pathsIncludingSelf.toList) { + ??? + } +} -- cgit v1.2.3