diff options
Diffstat (limited to 'src/reflect')
| -rw-r--r-- | src/reflect/scala/reflect/internal/TreeInfo.scala | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/src/reflect/scala/reflect/internal/TreeInfo.scala b/src/reflect/scala/reflect/internal/TreeInfo.scala index 3e74b5d22d..fa4441e513 100644 --- a/src/reflect/scala/reflect/internal/TreeInfo.scala +++ b/src/reflect/scala/reflect/internal/TreeInfo.scala @@ -17,7 +17,7 @@ abstract class TreeInfo { val global: SymbolTable import global._ - import definitions.{ isVarArgsList, isCastSymbol, ThrowableClass, TupleClass, MacroContextClass, MacroContextPrefixType } + import definitions.{ isTupleSymbol, isVarArgsList, isCastSymbol, ThrowableClass, TupleClass, MacroContextClass, MacroContextPrefixType } /* Does not seem to be used. Not sure what it does anyway. def isOwnerDefinition(tree: Tree): Boolean = tree match { @@ -515,6 +515,20 @@ abstract class TreeInfo { case _ => false } + /** + * {{{ + * //------------------------ => effectivePatternArity(args) + * case Extractor(a) => 1 + * case Extractor(a, b) => 2 + * case Extractor((a, b)) => 2 + * case Extractor(a @ (b, c)) => 2 + * }}} + */ + def effectivePatternArity(args: List[Tree]): Int = (args.map(unbind) match { + case Apply(fun, xs) :: Nil if isTupleSymbol(fun.symbol) => xs + case xs => xs + }).length + // used in the symbols for labeldefs and valdefs emitted by the pattern matcher // tailcalls, cps,... use this flag combination to detect translated matches |