diff options
Diffstat (limited to 'src/compiler/scala/tools/nsc/typechecker/Typers.scala')
| -rw-r--r-- | src/compiler/scala/tools/nsc/typechecker/Typers.scala | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/compiler/scala/tools/nsc/typechecker/Typers.scala b/src/compiler/scala/tools/nsc/typechecker/Typers.scala index 238727d2e9..53eafd956d 100644 --- a/src/compiler/scala/tools/nsc/typechecker/Typers.scala +++ b/src/compiler/scala/tools/nsc/typechecker/Typers.scala @@ -5108,7 +5108,7 @@ trait Typers extends Adaptations with Tags { if (mode.inPatternMode) { val uncheckedTypeExtractor = extractorForUncheckedType(tpt.pos, tptTyped.tpe) // make fully defined to avoid bounded wildcard types that may be in pt from calling dropExistential (SI-2038) - val ptDefined = ensureFullyDefined(pt) + val ptDefined = ensureFullyDefined(pt) // FIXME this is probably redundant now that we don't dropExistenial in pattern mode. val ownType = inferTypedPattern(tptTyped, tptTyped.tpe, ptDefined, canRemedy = uncheckedTypeExtractor.nonEmpty) treeTyped setType ownType @@ -5342,7 +5342,12 @@ trait Typers extends Adaptations with Tags { "context.owner" -> context.owner ) ) - typed1(tree, mode, dropExistential(ptPlugins)) + val ptWild = if (mode.inPatternMode) + ptPlugins // SI-5022 don't widen pt for patterns as types flow from it to the case body. + else + dropExistential(ptPlugins) // FIXME: document why this is done. + + typed1(tree, mode, ptWild) } // Can happen during erroneous compilation - error(s) have been // reported, but we need to avoid causing an NPE with this tree |