GitLab

Reviewers: austin, hvr, ekmett, RyanGlScott

Reviewed By: RyanGlScott

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1952

GHC Trac Issues: #11650

Most notably, this update pulls in documentation improvements
and several INLINE pragmas for significant performance gains[1].

 [1]: https://groups.google.com/d/msg/haskell-cafe/SUKtkDI84EE/fXMBd-jNDQAJ

Fixes Trac #11651.  Merge to 8.0.

We were failing to zonk, after quantifyTyVars, and that left
un-zonked type variables in the final PatSyn.

This fixes the patsyn/ problems in Trac #11648, but not
the polykinds/ ones.

There is a general invariant that the constraint solver doesn't see
TyVars, only TcTyVars.  But when checking the generic-default
signature of a class, we called checkValidType on the generic-default
type, which had the class TyVar free. That in turn meant that it wasn't
considered during flattening, which led to the error reported in
Trac #11608.

The fix is simple: call checkValidType on the /closed/ type. Easy.

While I was at it, I added a bunch of ASSERTs about the TcTyVar
invariant.

This fixes Trac #11600

When AbsBinds has no tyvars and no dicts, a rather simpler
desugaring is possible.  This patch implements it.

I don't think the optimised code changes, but there is
less clutter generated.

This patch was triggered by Trac #11601, where I discovered that
-XStrict was really not doing the right thing. In particular,

  f y = let !(Just x) = blah[y] in body[y,x]

This was evaluating 'blah' but not pattern matching it
against Just until x was demanded.  This is wrong.

The patch implements a new semantics which ensures that strict
patterns (i.e. ones with an explicit bang, or with -XStrict)
are evaluated fully when bound.

* There are extensive notes in DsUtils:
  Note [mkSelectorBinds]

* To do this I found I need one-tuples;
  see Note [One-tuples] in TysWiredIn

I updated the user manual to give the new semantics

Previously, we didn't add Template Haskell key names to the list
of known uniques when building a stage 1 compiler.  But with
f16ddcee we may refer to TH
names even in stage 1, and this was causing uniques to not
be setup properly.
Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Test Plan: validate and run stage1 test suite

Reviewers: osa1, austin, bgamari

Reviewed By: bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1520

GHC Trac Issues: #10382

Both gcc and clang tell which warning flag a reported warning can be
controlled with, this patch makes ghc do the same. More generally, this
allows for annotated compiler output, where an optional annotation is
displayed in brackets after the severity.

This also adds a new flag `-f(no-)show-warning-groups` to control
whether to show which warning-group (such as `-Wall` or `-Wcompat`)
a warning belongs to. This flag is on by default.

This implements #10752

Reviewed By: quchen, bgamari, hvr

Differential Revision: https://phabricator.haskell.org/D1943

Also prevent showing '\ No newline at end of file' in diff output.

For opt_ways or prof_ways only.

indexed-types/should_compile/all.T called setTestOpts to not run
the tests with opt_ways. Since I'm finding regressions for opt_ways, I
removed it. This only makes a difference when running
`./validate --slow` or `make slowtest`.

Update submodule hpc.

Instead of just profasm and profthreaded. And at least until
-fexternal-interpreter is the default.

Also:
  * WAY=profc doesn't exist anymore.
  * Omit all threaded_ways for conc039, not just a few.

Refactoring only.

Adds a new data constructor `PatSynOrigin Bool Name` to the `CtOrigin`
data type. This allows for better error messages when the origin of a
wanted constraint is a pattern synonym declaration.

Fixes T10873.

Reviewers: mpickering, simonpj, austin, thomie, bgamari

Reviewed By: simonpj, thomie, bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1866

GHC Trac Issues: #10873

The suggestion only makes sense when we try
to use an as pattern in an expression context.

It is misleading in the case of a lazy pattern and
view pattern.

Reviewers: austin, bgamari

Reviewed By: bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1948

Fixes #10398 in a different way, thereby also fixing #11579.

I inverted the logic of the Bool argument to "worker", to hopefully make
it more self-explanatory.

Reviewers: austin, hvr, bgamari

Reviewed By: bgamari

Differential Revision: https://phabricator.haskell.org/D1935

Issue a separate warning per redundant (or inaccessible) clause.
This way each warning can have more precice location information
(the location of the clause under consideration and not the whole
match).

I thought that this could be too much but actually the number of
such warnings is bound by the number of cases matched against (in
contrast to the non-exhaustive warnings which may be exponentially
more).

Test Plan: validate

Reviewers: simonpj, austin, bgamari

Reviewed By: bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1920

GHC Trac Issues: #8710

This comparison is only necessary when the types being compared contain
casts. Otherwise the structural equality of the types implies that their
kinds are equal.

Test Plan: Validate

Reviewers: goldfire, austin, simonpj

Reviewed By: simonpj

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1944

GHC Trac Issues: #11597

I believe this is probably due to the recent RuntimeRep change.

Reviewers: austin, rdragon, bgamari

Reviewed By: bgamari

Subscribers: rdragon, thomie

Differential Revision: https://phabricator.haskell.org/D1949

- Replace "Sigs" with "Signatures" in WarningFlag data constructors.
- Replace "PatSyn" with "PatternSynonym" in WarningFlag data
  constructors.
- Deprecate "missing-local-sigs" in favor of "missing-local-signatures".
- Deprecate "missing-exported-sigs" in favor of
  "missing-exported-signatures".
- Deprecate "missing-pat-syn-signatures" in favor of
  "missing-pattern-synonym-signatures".
- Replace "ddump-strsigs" with "ddump-str-signatures"

These complete the tasks that were explicitly mentioned in #11583

Test Plan:
Executed `ghc --show-options` and verified that the flags were changed
as expected.

Reviewers: svenpanne, austin, bgamari

Reviewed By: austin, bgamari

Subscribers: mpickering, thomie

Differential Revision: https://phabricator.haskell.org/D1939

GHC Trac Issues: #11583

GHC.Generics provides several representation data types that have
obvious instances of various type classes in base, along with various
other types of meta-data (such as associativity and fixity).
Specifically, instances have been added for the following type classes
(where possible):

    - Applicative
    - Data
    - Functor
    - Monad
    - MonadFix
    - MonadPlus
    - MonadZip
    - Foldable
    - Traversable
    - Enum
    - Bounded
    - Ix
    - Generic1

Thanks to ocharles for starting this!

Test Plan: Validate

Reviewers: ekmett, austin, hvr, bgamari

Reviewed By: bgamari

Subscribers: RyanGlScott, thomie

Differential Revision: https://phabricator.haskell.org/D1937

GHC Trac Issues: #9043

Reviewers: bgamari, austin

Reviewed By: austin

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1936

ApplicativeDo handled terminal `return` statements properly, but not
`pure`.

Test Plan: Validate with included testcase

Reviewers: austin, simonmar

Reviewed By: austin, simonmar

Subscribers: simonpj, thomie

Differential Revision: https://phabricator.haskell.org/D1931

GHC Trac Issues: #11607

Use `-- |` comments throughout.
Note that numByteUsageSamples is also the number of major GCs
Note that numGcs counts GCs for all generations
Note that 'current' really means 'at the end of the last major GC'

Reviewers: ezyang, hvr, simonmar, austin, bgamari

Reviewed By: ezyang, simonmar, bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1929

GHC Trac Issues: #11603

The following tests fail on powerpc64 and have a ticket.
Mark those tests as expect_broken.

Here are the details:
The PowerPC native code generator does not support DWARF debug
information. This is tracked in ticket #11261. Mark the respective
tests broken on powerpc64.

testsuite: mark print022 broken on powerpc64
Ticket #11262 tracks difference in stdout for print022.

testsuite: mark recomp015 broken on powerpc64
testsuite: mark recomp011 broken on powerpc64
This is tracked as ticket #11323 and #11260.

testsuite: mark linker tests broken on powerpc64
Ticket #11259 tracks tests failing because there is no RTS
linker on powerpc64.

Test Plan: validate

Reviewers: erikd, austin, bgamari

Reviewed By: bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1928

GHC Trac Issues: #11259, #11260, #11261, #11262, #11323

Static pointers are rarely used naked: most often they are defined at
the base of a Closure, as defined in e.g. the distributed-closure and
distributed-static packages. So a typical usage pattern is:

    distributeMap (closure (static (\x -> x * 2)))

which is more verbose than it needs to be. Ideally we'd just have to
write

    distributeMap (static (\x -> x * 2))

and let the static pointer be lifted to a Closure implicitly. i.e.
what we want is to overload static literals, just like we already
overload list literals and string literals.

This is achieved by introducing the IsStatic type class and changing
the typing rule for static forms slightly:

    static (e :: t) :: IsStatic p => p t

Test Plan: ./validate

Reviewers: austin, hvr, bgamari

Reviewed By: bgamari

Subscribers: simonpj, mboes, thomie

Differential Revision: https://phabricator.haskell.org/D1923

GHC Trac Issues: #11585

Reviewers: austin, bgamari, simonpj

Reviewed By: simonpj

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1933

See Note [TYPE] in TysPrim. There are still some outstanding
pieces in #11471 though, so this doesn't actually nail the bug.

This commit also contains a few performance improvements:

* Short-cut equality checking of nullary type syns

* Compare types before kinds in eqType

* INLINE coreViewOneStarKind

* Store tycon binders separately from kinds.

This resulted in a ~10% performance improvement in compiling
the Cabal package. No change in functionality other than
performance. (This affects the interface file format, though.)

This commit updates the haddock submodule.

...forgot to stage/add this alpha renaming to the previous commit

The original implementation for #11429 covers only `-W*` flags. However,
old packages will continue to use `-f(no-)warn-*` flags, so it seems
desirable to have `-Wunrecognised-warning-flag` apply to those legacy aliases
as well.

Reviewed By: bgamari

Differential Revision: https://phabricator.haskell.org/D1942

Call `+$(PYTHON) ...` to fix #11569 instead.

See Note [Communicating options and variables to a submake].

Reviewed by: austin, rwbarton

Differential Revision: https://phabricator.haskell.org/D1938