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>CoreArity</TITLE
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>ghc-6.12.3: The GHC API</TD
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>Contents</A
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>CoreArity</FONT
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><TD CLASS="section1"
>Description</TD
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><TD CLASS="doc"
>Arit and eta expansion
</TD
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>Synopsis</TD
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><TD CLASS="decl"
><A HREF="#v%3AmanifestArity"
>manifestArity</A
> :: <A HREF="CoreSyn.html#t%3ACoreExpr"
>CoreExpr</A
> -> <A HREF="BasicTypes.html#t%3AArity"
>Arity</A
></TD
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><TR
><TD CLASS="s8"
></TD
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><TR
><TD CLASS="decl"
><A HREF="#v%3AexprArity"
>exprArity</A
> :: <A HREF="CoreSyn.html#t%3ACoreExpr"
>CoreExpr</A
> -> <A HREF="BasicTypes.html#t%3AArity"
>Arity</A
></TD
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><TR
><TD CLASS="s8"
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><TD CLASS="decl"
><A HREF="#v%3AexprEtaExpandArity"
>exprEtaExpandArity</A
> :: <A HREF="DynFlags.html#t%3ADynFlags"
>DynFlags</A
> -> <A HREF="CoreSyn.html#t%3ACoreExpr"
>CoreExpr</A
> -> <A HREF="BasicTypes.html#t%3AArity"
>Arity</A
></TD
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><TD CLASS="s8"
></TD
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><TR
><TD CLASS="decl"
><A HREF="#v%3AetaExpand"
>etaExpand</A
> :: <A HREF="BasicTypes.html#t%3AArity"
>Arity</A
> -> <A HREF="CoreSyn.html#t%3ACoreExpr"
>CoreExpr</A
> -> <A HREF="CoreSyn.html#t%3ACoreExpr"
>CoreExpr</A
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>Documentation</TD
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><TD CLASS="decl"
><A NAME="v:manifestArity"
><A NAME="v%3AmanifestArity"
></A
></A
><B
>manifestArity</B
> :: <A HREF="CoreSyn.html#t%3ACoreExpr"
>CoreExpr</A
> -> <A HREF="BasicTypes.html#t%3AArity"
>Arity</A
></TD
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><TD CLASS="doc"
>manifestArity sees how many leading value lambdas there are
</TD
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></TD
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><TD CLASS="decl"
><A NAME="v:exprArity"
><A NAME="v%3AexprArity"
></A
></A
><B
>exprArity</B
> :: <A HREF="CoreSyn.html#t%3ACoreExpr"
>CoreExpr</A
> -> <A HREF="BasicTypes.html#t%3AArity"
>Arity</A
></TD
></TR
><TR
><TD CLASS="doc"
><P
>An approximate, fast, version of <TT
><A HREF="CoreArity.html#v%3AexprEtaExpandArity"
>exprEtaExpandArity</A
></TT
>
</P
><P
>The Arity returned is the number of value args the
expression can be applied to without doing much work
</P
></TD
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></TD
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><TD CLASS="decl"
><A NAME="v:exprEtaExpandArity"
><A NAME="v%3AexprEtaExpandArity"
></A
></A
><B
>exprEtaExpandArity</B
> :: <A HREF="DynFlags.html#t%3ADynFlags"
>DynFlags</A
> -> <A HREF="CoreSyn.html#t%3ACoreExpr"
>CoreExpr</A
> -> <A HREF="BasicTypes.html#t%3AArity"
>Arity</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
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><TD CLASS="decl"
><A NAME="v:etaExpand"
><A NAME="v%3AetaExpand"
></A
></A
><B
>etaExpand</B
></TD
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><TD CLASS="arg"
>:: <A HREF="BasicTypes.html#t%3AArity"
>Arity</A
></TD
><TD CLASS="rdoc"
>Result should have this number of value args
</TD
></TR
><TR
><TD CLASS="arg"
>-> <A HREF="CoreSyn.html#t%3ACoreExpr"
>CoreExpr</A
></TD
><TD CLASS="rdoc"
>Expression to expand
</TD
></TR
><TR
><TD CLASS="arg"
>-> <A HREF="CoreSyn.html#t%3ACoreExpr"
>CoreExpr</A
></TD
><TD CLASS="rdoc"
></TD
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><TR
><TD CLASS="ndoc" COLSPAN="2"
><P
><TT
>etaExpand n us e ty</TT
> returns an expression with
the same meaning as <TT
>e</TT
>, but with arity <TT
>n</TT
>.
</P
><P
>Given:
</P
><PRE
> e' = etaExpand n us e ty
</PRE
><P
>We should have that:
</P
><PRE
> ty = exprType e = exprType e'
</PRE
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