`dhall lint` was incorrectly deleting `let` bindings that are being used
due to not checking other `let` bindings within the same multi-`let`
expression for free variable occurrences.
This change fixes that and adds the first regression test for `dhall
lint`
Fixes#692
The standard permits a user to access a constructor from a type stored inside
a record, but the Haskell implementation had a mistake which prevented this.
Specifically, the Haskell implementation was not normalizing the union type
as the standard specified before attempting to access the constructor, leading
to an unexpected type error.
This begins updates the filesystem layout for the tests to match
the new layout from the standard test suite (See:
https://github.com/dhall-lang/dhall-lang/pull/265)
This is still missing a part of the standard requirement, which is checking
parsing and import test results against an expected output (instead of
just checking that they succeed). I plan to add that in a subsequent
pull request. This is mainly to unblock other features that require using
the new standard layout.
Fixes https://github.com/dhall-lang/dhall-lang/issues/267
According to the standard, Unicode characters up to `0x10FFFF` do not
require escaping. See:
33cab24f8e/standard/dhall.abnf (L192)
... so we can preserve them when pretty-printing Dhall expressions.
Note that the current code still does not comply with the standard for Unicode
characters beyond `0x10FFFF`, but I'll defer fixing that to a subsequent
change.
The issue was that the parser was attempting to parse // first, which
will succeed on the prefix of //\\, then the parser will get an error
because it expects a sub expression but the input is \\.
The motivation for this change is:
* To catch build failures in downstream packages whenever we make a breaking
change to the `dhall` API
* To reduce the amount of work I need in order to cut a release for all of
these packages
* To better share Nix/CI-related logic between the projects
Note that I have not yet migrated `dhall-nix` in. I'm waiting for
https://github.com/dhall-lang/dhall-nix/issues/17 to be fixed since
`dhall-nix` is incompatible with later versions of `megaparsec` due to
`hnix`.
