(Since version 2.11.0) Use internal.freeTerms instead or import internal.decorators._ for infix syntax
(Since version 2.11.0) Use internal.freeTerms instead or import internal.decorators._ for infix syntax
(Since version 2.11.0) Use internal.substituteSymbols instead or import internal.decorators._ for infix syntax
(Since version 2.11.0) Use internal.substituteThis instead or import internal.decorators._ for infix syntax
(Since version 2.11.0) Use internal.substituteTypes instead or import internal.decorators._ for infix syntax
Scala 2.10 compatibility enrichments for Tree.