stubMain now catches exceptions

Fix #3752, don't specify compiler/optimization twice.

[ci skip]

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Old versions of Distribution.Compat.Prelude export a catch that
conflicts with Control.Exception.catch.  I didn't see any other
hiding clauses in the import here, so I just qualified the
Control.Exception import.

Include program args in PackageHash

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Fix  `simpleUsage` example in docs.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Docs for nix-local-build

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Update developing-packages.markdown

Document that any hyphened section may not consist of only numbers

Document illegal package names ending in a hyphen and numbers

This implements a new syntactic sugar: The version range operator
`^>=` which is equivalent to `>=` intersected with an
automatically inferred major upper bound.

This new syntax is only allowed for `cabal-version: >=2.0`, and
allows to describe the most common use of version
bounds more conveniently:

    build-depends: foo ^>= 1.2.3.4,
                   bar ^>= 1

The declaration above is exactly equivalent to

    build-depends: foo >= 1.2.3.4 && < 1.3,
                   bar >= 1 && < 1.1

This also helps with the issue of the wildcard operator having the
surprising effect that e.g. `== 1.0.*` does not include the single 
digit version `1`.

The `^`-symbol was chosen because it can serve as a mnemonic when the
`>` sign is rotated and interpreted as "less than ceiling"

Moreover, `^` appears to become a quasi-standard to denote morally
equivalent operator that way in other language ecosystems which similiar
to Haskell have adopted semantic versioning:

 - Node: https://nodesource.com/blog/semver-tilde-and-caret/
 - Bower: https://bower.io/docs/api/#install
 - PHP: https://getcomposer.org/doc/articles/versions.md#caret

Ruby, on the other hand, uses a Tilde operator (`~>`) for that
purpose (but with a less robust semantic):

 - https://blog.codeship.com/optimists-guide-pessimistic-library-versioning

And Python is currently planing to use an `~=` operator:

 - https://www.python.org/dev/peps/pep-0440/#compatible-release

stack.yaml/nix: add required build and test tools

Respect GHC_PACKAGE_PATH

Fixes #3728. Fixes #2711.

Fix #3391: build all packages if no target is specified.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Fix typo in haddock comment

Stop recommending detailed-0.9, no one actually believes that.

This was overlooked in  a8a121ea

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>