diff options
| -rw-r--r-- | src/compiler/scala/tools/nsc/transform/patmat/MatchTreeMaking.scala | 2 | ||||
| -rw-r--r-- | src/library/scala/annotation/switch.scala | 3 | ||||
| -rw-r--r-- | test/files/neg/t8731.check | 5 |
3 files changed, 4 insertions, 6 deletions
diff --git a/src/compiler/scala/tools/nsc/transform/patmat/MatchTreeMaking.scala b/src/compiler/scala/tools/nsc/transform/patmat/MatchTreeMaking.scala index b703b5bc6d..e1fe220556 100644 --- a/src/compiler/scala/tools/nsc/transform/patmat/MatchTreeMaking.scala +++ b/src/compiler/scala/tools/nsc/transform/patmat/MatchTreeMaking.scala @@ -577,8 +577,6 @@ trait MatchTreeMaking extends MatchCodeGen with Debugging { lengthMax3(casesNoSubstOnly) > 2 } val requireSwitch = hasSwitchAnnotation && exceedsTwoCasesOrAlts - if (hasSwitchAnnotation && !requireSwitch) - reporter.warning(scrut.pos, "matches with two cases or fewer are emitted using if-then-else instead of switch") (suppression, requireSwitch) case _ => (Suppression.NoSuppression, false) diff --git a/src/library/scala/annotation/switch.scala b/src/library/scala/annotation/switch.scala index 23e3923407..00124cf88b 100644 --- a/src/library/scala/annotation/switch.scala +++ b/src/library/scala/annotation/switch.scala @@ -22,6 +22,9 @@ package scala.annotation } }}} * + * Note: for pattern matches with one or two cases, the compiler generates jump instructions. + * Annotating such a match with `@switch` does not issue any warning. + * * @author Paul Phillips * @since 2.8 */ diff --git a/test/files/neg/t8731.check b/test/files/neg/t8731.check index 2a9af475fc..d47bd55b45 100644 --- a/test/files/neg/t8731.check +++ b/test/files/neg/t8731.check @@ -1,9 +1,6 @@ -t8731.scala:5: warning: matches with two cases or fewer are emitted using if-then-else instead of switch - def f(x: Int) = (x: @annotation.switch) match { - ^ t8731.scala:10: warning: could not emit switch for @switch annotated match def g(x: Int) = (x: @annotation.switch) match { ^ error: No warnings can be incurred under -Xfatal-warnings. -two warnings found +one warning found one error found |