nix-super/doc/manual/src/release-notes/rl-1.6.1.md

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# Release 1.6.1 (2013-10-28)
This is primarily a bug fix release. Changes of interest are:
- Nix 1.6 accidentally changed the semantics of antiquoted paths in
strings, such as `"${/foo}/bar"`. This release reverts to the Nix
1.5.3 behaviour.
- Previously, Nix optimised expressions such as `"${expr}"` to *expr*.
Thus it neither checked whether *expr* could be coerced to a string,
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nor applied such coercions. This meant that `"${123}"` evaluatued to
`123`, and `"${./foo}"` evaluated to `./foo` (even though `"${./foo}
"` evaluates to `"/nix/store/hash-foo "`). Nix now checks the type
of antiquoted expressions and applies coercions.
- Nix now shows the exact position of undefined variables. In
particular, undefined variable errors in a `with` previously didn't
show *any* position information, so this makes it a lot easier to
fix such errors.
- Undefined variables are now treated consistently. Previously, the
`tryEval` function would catch undefined variables inside a `with`
but not outside. Now `tryEval` never catches undefined variables.
- Bash completion in `nix-shell` now works correctly.
- Stack traces are less verbose: they no longer show calls to builtin
functions and only show a single line for each derivation on the
call stack.
- New built-in function: `builtins.typeOf`, which returns the type of
its argument as a string.