diff options
Diffstat (limited to 'src/compiler/scala/tools/nsc/transform/patmat/ScalacPatternExpanders.scala')
-rw-r--r-- | src/compiler/scala/tools/nsc/transform/patmat/ScalacPatternExpanders.scala | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/compiler/scala/tools/nsc/transform/patmat/ScalacPatternExpanders.scala b/src/compiler/scala/tools/nsc/transform/patmat/ScalacPatternExpanders.scala index 8924394b72..2753baa51d 100644 --- a/src/compiler/scala/tools/nsc/transform/patmat/ScalacPatternExpanders.scala +++ b/src/compiler/scala/tools/nsc/transform/patmat/ScalacPatternExpanders.scala @@ -110,8 +110,10 @@ trait ScalacPatternExpanders { err("Star pattern must correspond with varargs or unapplySeq") else if (elementArity < 0) arityError("not enough") - else if (elementArity > 0 && !extractor.hasSeq) + else if (elementArity > 0 && !isSeq) arityError("too many") + else if (settings.warnStarsAlign && isSeq && productArity > 0 && (elementArity > 0 || !isStar)) + warn("A repeated case parameter or extracted sequence should be matched only by a sequence wildcard (_*).") aligned } |