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author | Eelco Dolstra <e.dolstra@tudelft.nl> | 2004-10-25T16·54+0000 |
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committer | Eelco Dolstra <e.dolstra@tudelft.nl> | 2004-10-25T16·54+0000 |
commit | 37d7abd69402f0e7a78d4d2f2d78996409a8563a (patch) | |
tree | bf844e4486b0e055921583c4b7c2d3d843b34485 /INSTALL | |
parent | f4d44a002688262d33093494a7fea1bb11b97ac9 (diff) |
* New language feature: with expressions.
The expression `with E1; E2' evaluates to E2 with all bindings in the attribute set E1 substituted. E.g., with {x = 123;}; x evaluates to 123. That is, the attribute set E1 is in scope in E2. This is particularly useful when importing files containing lots definitions. E.g., instead of let { inherit (import ./foo.nix) a b c d e f; body = ... a ... f ...; } we can now say with import ./foo.nix; ... a ... f ... I.e., we don't have to say what variables should be brought into scope.
Diffstat (limited to 'INSTALL')
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