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authorEelco Dolstra <e.dolstra@tudelft.nl>2006-10-16T15·55+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2006-10-16T15·55+0000
commitd7efd7639420f4c840cbfdfcbbb3c45292f3ac54 (patch)
treed48871893e6d3446b6298b0e5e612086233e3947 /configure.ac
parent4c9aa821b985b8e334790a03497a56af3a021f3b (diff)
* Big cleanup of the semantics of paths, strings, contexts, string
  concatenation and string coercion.  This was a big mess (see
  e.g. NIX-67).  Contexts are now folded into strings, so that they
  don't cause evaluation errors when they're not expected.  The
  semantics of paths has been clarified (see nixexpr-ast.def).
  toString() and coerceToString() have been merged.

  Semantic change: paths are now copied to the store when they're in a
  concatenation (and in most other situations - that's the
  formalisation of the meaning of a path).  So

    "foo " + ./bla

  evaluates to "foo /nix/store/hash...-bla", not "foo
  /path/to/current-dir/bla".  This prevents accidental impurities, and
  is more consistent with the treatment of derivation outputs, e.g.,
  `"foo " + bla' where `bla' is a derivation.  (Here `bla' would be
  replaced by the output path of `bla'.)

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