c34e6d71bc
broken, but now the evaluator checks for it to prevent Nix
expressions from relying on undefined behaviour. Equality tests are
implemented using a shallow pointer equality test between ATerms.
However, because attribute sets are lazy and contain position
information, this can give false positives. For instance,
previously
let y = {x = 1;}; in y == y
evaluated to true, while the equivalent expression
{x = 1;} == {x = 1;}
evaluated to false. So disallow these tests for now. (Eventually
we may want to implement deep equality tests for attribute sets,
like lib.eqStrict.)
* Idem: disallow comparisons between functions.
* Implemented deep comparisons of lists. This had the same problem as
attribute sets - the elements in the list weren't evaluated. For
instance,
["xy"] == [("x" + "y")]
evaluated to false. Now it works properly.
|
||
|---|---|---|
| .. | ||
| attr-path.cc | ||
| attr-path.hh | ||
| common-opts.cc | ||
| common-opts.hh | ||
| eval.cc | ||
| eval.hh | ||
| expr-to-xml.cc | ||
| expr-to-xml.hh | ||
| get-drvs.cc | ||
| get-drvs.hh | ||
| lexer.l | ||
| Makefile.am | ||
| names.cc | ||
| names.hh | ||
| nix.sdf | ||
| nixexpr-ast.def | ||
| nixexpr.cc | ||
| nixexpr.hh | ||
| parser.hh | ||
| parser.y | ||
| primops.cc | ||