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SI-6640 Better reporting of deficient classpaths.
In a55788e, StubSymbols were introduced to fail-slow when the classpath was deficient. This allowed compilation to succeed in cases when one didn't actually use the part of class A which referred to some missing class B. But a few problems were introduced. Firstly, when the deferred error eventually happened, it was signalled with abort(msg), rather than through a thrown MissingRequirementError. The latter is desirable, as it doesn't lead to printing a stack trace. Second, the actual error message changed, and no longer included the name of the class file that refers to the missing class. Finally, it seems that we can end up with a stub term symbol in a situation where a class symbol is desired. An assertion in the constructor of ThisType throws trips when calling .isClass, before the useful error message from StubSymbol can be emitted. This commit addresses these points, and rewords the error a little to be more accessible. The last point is the most fragile in this arrangement, there might be some whack-a-mole required to find other places that also need this. I don't see a clean solution for this, but am open to suggestions. We should really build a facility in partest to delete specified classfiles between groups in separate compilation tests, in order to have tests for this. I'll work on that as a followup. For now, here's the result of my manual testing: [info] Set current project to default-821d14 (in build file:/Users/jason/code/scratch1/) > compile [info] Compiling 1 Scala source to /Users/jason/code/scratch1/target/scala-2.10/classes... [error] [error] while compiling: /Users/jason/code/scratch1/test.scala [error] during phase: typer [error] library version: version 2.10.0-RC2 [error] compiler version: version 2.10.0-RC2 ... [error] last tree to typer: Ident(SwingWorker) [error] symbol: <none> (flags: ) [error] symbol definition: <none> [error] symbol owners: [error] context owners: object Test -> package <empty> ... [error] uncaught exception during compilation: java.lang.AssertionError [trace] Stack trace suppressed: run last compile:compile for the full output. [error] (compile:compile) java.lang.AssertionError: assertion failed: value actors [error] Total time: 2 s, completed Nov 10, 2012 3:18:34 PM > > set scalaHome := Some(file("/Users/jason/code/scala/build/pack")) [info] Defining *:scala-home [info] The new value will be used by no settings or tasks. [info] Reapplying settings... [info] Set current project to default-821d14 (in build file:/Users/jason/code/scratch1/) ^[compile [info] Compiling 1 Scala source to /Users/jason/code/scratch1/target/scala-2.10/classes... [error] /Users/jason/code/scratch1/test.scala:4: A signature in SwingWorker.class refers to term actors in package scala which is missing from the classpath. [error] object Test extends SwingWorker [error] ^ [error] one error found [error] (compile:compile) Compilation failed [error] Total time: 2 s, completed Nov 10, 2012 3:18:45 PM
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