I was surprised to see so many legacy lambda syntax examples in the
documentation. This replaces all of them with the new syntax -- excluding
the handful of cases meant to explicitly verify the legacy form is still
valid. This also adds a link to the issue in the release notes which
documents the change in syntax.
Related #664
Replaces uses of the deprecated builtin `prclose` and `pwclose` commands
with `file close` in unit tests.
This also fixes one test that was not verifying what it intended due to
it's use of `.Throws(AnyError)` which was matching an Elvish error caused
by invalid command `file:prclose $p`.
Including the float64 data type in the prompt value stream causes an error.
This causes those values to be implicitly converted to a string as happens
everywhere else in Elvish.
I initially intended to modify the code to do the implicit string coercion
for any type not otherwise explicitly handled by the pkg/ui `Concat`
methods. I decided against that approach because doing so doesn't make
sense for some types that might appear in the value stream; e.g., Elvish
exceptions.
Fixes#1186
