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SI-6576 Workaround / diagnostic for IDE NPE.

Seems like this was too optimistic:

> // later by lukas: disabled when fixing SI-5975
> // i think it cannot happen anymore

 - restored the null check
 - added logging when we set the namer in this attachment,
   in the hope of spotting a pattern in the wild.

We don't have a test case yet; if we did we could most likely
have a more principled fix. But this should suffice for 2.10.1.
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1 parent cc89bd7 commit 19649d425a761f9d6b91641df92d604f60124d08 @retronym retronym committed
Showing with 6 additions and 2 deletions.
  1. +6 −2 src/compiler/scala/tools/nsc/typechecker/Namers.scala
8 src/compiler/scala/tools/nsc/typechecker/Namers.scala
@@ -908,6 +908,7 @@ trait Namers extends MethodSynthesis {
// to use. clazz is the ModuleClass. sourceModule works also for classes defined in methods.
val module = clazz.sourceModule
for (cda <- module.attachments.get[ConstructorDefaultsAttachment]) {
+ debuglog(s"Storing the template namer in the ConstructorDefaultsAttachment of ${module.debugLocationString}.")
cda.companionModuleClassNamer = templateNamer
val classTp = ClassInfoType(parents, decls, clazz)
@@ -1229,8 +1230,11 @@ trait Namers extends MethodSynthesis {
// module's templateNamer to classAndNamerOfModule
module.attachments.get[ConstructorDefaultsAttachment] match {
// by martin: the null case can happen in IDE; this is really an ugly hack on top of an ugly hack but it seems to work
- // later by lukas: disabled when fixing SI-5975, i think it cannot happen anymore
- case Some(cda) /*if cma.companionModuleClassNamer == null*/ =>
+ case Some(cda) =>
+ if (cda.companionModuleClassNamer == null) {
+ debugwarn(s"SI-6576 The companion module namer for $meth was unexpectedly null")
+ return
+ }
val p = (cda.classWithDefault, cda.companionModuleClassNamer)
moduleNamer = Some(p)

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