scala 2.10.0-M7 compiler crash

gistfile1.txt

source file:
----------- 

https://github.com/playframework/Play20/blob/master/framework/src/play/src/main/scala/play/api/libs/json/Util.scala


trace:
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[error]   last tree to typer: Ident(_root_) 
[error]               symbol: package _root_ (flags: final <module> 
<package> <java> <static> <triedcooking>) 
[error]    symbol definition: final package _root_ 
[error]                  tpe: <root> 
[error]        symbol owners: package _root_ 
[error]       context owners: type A14 -> method ~ -> class CanBuild13 
-> class FunctionalBuilder -> package util 
[error] 
[error] == Enclosing template or block == 
[error] 
[error] DefDef( // def ~: <?> in class CanBuild13 
[error]   <method> 
[error]   "$tilde" 
[error]   TypeDef( // A14 
[error]     <deferred> <param> 
[error]     "A14" 
[error]     [] 
[error]     TypeBoundsTree( 
[error]       "_root_"."scala"."Nothing" 
[error]       "_root_"."scala"."Any" 
[error]     ) 
[error]   ) 
[error]   // 1 parameter list 
[error]   ValDef( // m3: M[A14] 
[error]     <param> <triedcooking> 
[error]     "m3" 
[error]     AppliedTypeTree( // M[_] in class FunctionalBuilder 
[error]       "M" // M[_] in class FunctionalBuilder, tree.tpe=M 
[error]       "A14" // A14, tree.tpe=A14 
[error]     ) 
[error]     <empty> 
[error]   ) 
[error]   <tpt> 
[error]   Apply( 
[error]     new CanBuild14."<init>" 
[error]     // 2 arguments 
[error]     Apply( 
[error]       "canBuild" 
[error]       // 2 arguments 
[error]       "m1" 
[error]       "m2" 
[error]     ) 
[error]     "m3" // m3: M[A14], tree.tpe=M[A14] 
[error]   ) 
[error] ) 
[error] 
[error] == Expanded type of tree == 
[error] 
[error] ThisType(package <root>)