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* Refactoring: combine functions that take an attribute set and

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functions that take a single argument (plain lambdas) into one AST
  node (Function) that contains a Pattern node describing the
  arguments.  Current patterns are single lazy arguments (VarPat) and
  matching against an attribute set (AttrsPat).

  This refactoring allows other kinds of patterns to be added easily,
  such as Haskell-style @-patterns, or list pattern matching.
This commit is contained in:
Eelco Dolstra 2008-08-14 10:04:22 +00:00
parent c03b729319
commit efe4b690ae
12 changed files with 184 additions and 148 deletions
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4
src/libexpr/nixexpr.hh
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@ -21,11 +21,9 @@ MakeError(TypeError, EvalError)
property of the ATerm library allows us to implement caching of
normals forms efficiently. */
typedef ATerm Expr;
typedef ATerm DefaultValue;
typedef ATerm ValidValues;
typedef ATerm Pos;
typedef ATerm Pattern;
/* A STL vector of ATerms. Should be used with great care since it's