Changelog for dhall-1.2.0

1.2.0

BREAKING CHANGE: Add support for customizing derived Interpret instances
- This is a breaking change to the Dhall library API since this changes the signature of the Interpret class by replacing the auto method with a more general autoWith method. This autoWith now takes an InterpretOptions argument that lets you customize derived field and constuctor names
- In practice user programs that use the common path will be unaffected by this change
- This is not a breaking change to the Dhall language
BREAKING CHANGE: Type annotations now bind more tightly than lambda abstraction
- This is a breaking change to the Dhall language. An expression like this:
```
λ(x : A) → y : B
```
  ... used to parenthesized implicitly as:
```
(λ(x : A) → y) : T
```
  ... but is now parenthesized implicitly as:
```
λ(x : A) → (y : T)
```
  This is now consistent with Haskell's precedence and also consistent with the precedence of List and Optional type annotations
- This change affects programs with an expression like this:
```
-- Assuming that `y : B`
λ(x : A) → y : A → B
```
  The above program would type-check before this change but not type-check after this change. You would you need to fix the above program by either changing the type signature to annotate just the type of y like this:
```
λ(x : A) → y : B
```
  ... or by adding explicit parentheses like this:
```
(λ(x : A) → y) : A → B
```
- This is not a breaking change to the Dhall library API
BREAKING CHANGE: Add support for importing a path's contents as raw Text by adding as Text after the import
- This is a breaking change to the Dhall language
- This is technically a breaking change, but is extremely unlikely to affect you program. This only changes the behavior of old programs that had an expression of the form:
```
/some/imported/function as Text
```
  ... where /some/imported/function is an imported function being applied to two arguments, the first of which is a bound variable named as and the second of which is the type Text
- This is not a breaking change to the Dhall library API
BREAKING CHANGE: Add support for importing environment variables using env:VAR syntax
- This is a breaking change to the Dhall library API since it adds a new Path constructor
- This also technically a breaking change to the Dhall language but extremely unlikely to affect your program. This only changes the behavior of old programs that had an expression of the form:
```
env:VAR
```
  ... where env was the name of a bound variable and :VAR was a type annotation without spaces around the type annotation operator
  
  After this change the program would be interpreted as an import of the contents for the environment variable named VAR
BREAKING CHANGE: Support importing paths relative to home directory using ~/some/path syntax
- This is a breaking change to the Dhall library API since it adds a new field to the File constructor indicating whether or not the imported path is relative to the home directory
- This is not a breaking change to the Dhall language and the new syntax does not override any old syntax
Permit trailing commas and bars in record/union syntax
Improve location information for parsing errors

1.1.0

BREAKING CHANGE: Non-empty lists no longer require a type annotation
- This is a breaking change to the Haskell library, not the Dhall language
- This change does not break existing Dhall programs
- The Expr type was modified in a non-backwards-compatible way
Add new exprA parser
Add new InvalidType exception if input fails on an invalid Type
Improve documentation and tutorial

1.0.2

Add support for Nix-style "double single-quote" multi-line string literals
Add isNormalized
Improve documentation and tutorial
Build against wider range of http-client versions

1.0.1

Initial release

1.0.0

Accidental premature upload to Hackage. This release was blacklisted