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-
-The present Scala compiler does not yet implement all of the Scala
-specification. Its currently existing omissions and deviations are
-listed below. We are working on a refined implementation that
-addresses these issues.
-\begin{enumerate}
-\item
-Unicode support is still limited. At present we only permit Unicode
-encodings \verb@\uXXXX@ in strings and backquote-enclosed identifiers.
-To define or access a Unicode identifier, you need to put it in
-backquotes and use the \verb@\uXXXX@ encoding.
-\item
-The unicode operator ``$\Rightarrow$''
-(\sref{sec:idents}) is not yet recognized; you need to use the two
-character ASCII equivalent ``\code{=>}'' instead.
-\item
-The current implementation does not yet support run-time types.
-All types are erased (\sref{sec:erasure}) during compilation. This means that
-the following operations give potentially wrong results.
-\begin{itemize}
-\item
-Type tests and type casts to parameterized types. Here it is only tested
-that a value is an instance of the given top-level type constructor.
-\item
-Type tests and type casts to type parameters and abstract types. Here
-it is only tested that a value is an instance of the type parameter's upper bound.
-\item
-Polymorphic array creation. If \code{t} is a type variable or abstract type, then
-\code{new Array[t]} will yield an array of the upper bound of \code{t}.
-\end{itemize}
-\item
-Return expressions are not yet permitted inside an anonymous function
-or inside a call-by-name argument (i.e.\ a function argument corresponding to a
-\code{def} parameter).
-\item
-Members of the empty package (\sref{sec:packagings}) cannot yet be
-accessed from other source files. Hence, all library classes and
-objects have to be in some package.
-\item
-At present, auxiliary constructors (\sref{sec:constr-defs}) are only permitted
-for monomorphic classes.
-\item
-The \code{Array} class supports as yet only a restricted set of
-operations as given in \sref{cls:array}. It is planned to extend that
-interface. In particular, arrays will implement the \code{scala.Seq}
-trait as well as the methods needed to support for-comprehensions.
-\item
-At present, all classes used as mixins must be accessible to the Scala
-compiler in source form.
-\end{enumerate}