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Added extra ()'s to get rid of deprecation warning for inferring unit arg.
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SI-6196 - Set should implement filter
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This is the exact same algorithm as in SI-6196, with only slight
differences due to the two type arguments of HashMap.
Filter is tested by the new comparative collection test by @Ichoran, but
there is nevertheless a small correctness test in t6200 in addition to
tests of the new desirable behavior.
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Implements a version of filter and filterNot that reuses as much as
possible from the existing tree instead of building an entirely new one
like the builder-based filter does. This results in significant performance
improvements on average.
Adds a test of basic correctness of filter and filterNot as well as of the
desirable properties of the new filter implementation.
This is a collaboration between me and @Ichoran
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Quasi-comprehensive BigDecimal soundness/correctness fix.
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This fixes issues SI-6153, SI-6173, SI-6456, SI-6699, and SI-8116, along with a number of other similar possible issues.
Relevant changes include
* Changes to avoid heap explosion when working with BigInt
- to isWhole
- to hashCode
- to equals
- to BigInt's equals
* Changes to enable equality matching hashCode
- Only for sufficiently small BigInt
- For identical values with different precision
* Changes to isValidDouble
- Takes precision into account now
- New methods added to test whether even if the Double is not represented exactly, it's a representation of a certain type
- New companion methods added to allow intended expansion of Double (binary/decimal difference)
* Changes to constructor
- Null arguments are not allowed (these can throw NPEs later at awkward/unexpected times)
* New JUnit test to test all these things
* Fixed existing tests to expect new behavior
* Modified scaladocs to explain the issues
* Deprecated problematic methods
* Made application of MathContext more consistent (it is where you expect it and not where you don't)
These changes are coordinated, for the most part, hence the monolithic
commit.
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SI-8100 - prevent possible SOE during Stream#flatten.
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This commit changes stream flatten to avoid allocating a
stack frame for every stream item. Previously, flattening
a stream whose elements are mostly empty would result in
a StackOverflowException.
This commit also adds a test demonstrating the problem.
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Remove misc. @deprecated elements
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Count lines by EOLs
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The line content to display should include the whole line,
inclusive of embedded line breaks, and any control chars
should be displayed in unicode escape.
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Source lines were counted by "line break chars", including FF.
Clients of `pos.line` seem to all expect the ordinary line num,
so that is what they get.
Unicode processing now precedes line ending processing.
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Deprecate automatic () insertion in argument lists
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This promotes the () insertion warning from -Ywarn-adapted-args to a
deprecation warning. -Xfuture tunrs it into a compiler error.
Auto tupling remains unchanged for now.
The tests have been fixed the following way:
- Warnings caused by general sloppiness (Try(), Future(), ...) have been
fixed.
- Warnings which raise interesting questions (x == (), ...) received an
updated checkfile for now.
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Add tree-based code generation
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def printTypeParams is modified. Tests are updated.
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SI-8132 Fix false "overrides nothing" for case class protected param
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Case class parameters that are less-than-public have an accessor
method created. In the enclosed test, we saw:
case class G extends AnyRef with T with Product with Serializable {
override <synthetic> <stable> <caseaccessor> def s$1: String = G.this.s;
<caseaccessor> <paramaccessor> private[this] val s: String = _;
override <stable> <accessor> <paramaccessor> protected def s: String = G.this.s;
...
}
This commit removes the OVERRIDE flag from the accessor method,
which avoids the spurious "overrides nothing" error.
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Implements specialized subsetOf for HashSet
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Fixes SI-7326. This also adds a basic test for subsetOf that was missing before.
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Fix non-deterministic <:< for deeply nested types
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In the interests of keeping subtyping decidable [1], 152563b
added some bookkeeping to `isSubType` to detect cycles.
However, this was based on a hash set containing instances of
`SubTypePair`, and that class had inconsistencies between its
`hashCode` (in terms of `Type#hashCode`) and `equals`
(in terms of `=:=`).
This inconsistency can be seen in:
scala> trait C { def apply: (Int @unchecked) }
defined trait C
scala> val intUnchecked = typeOf[C].decls.head.info.finalResultType
intUnchecked: $r.intp.global.Type = Int @unchecked
scala> val p1 = new SubTypePair(intUnchecked, intUnchecked)
p1: $r.intp.global.SubTypePair = Int @unchecked <:<? Int @unchecked
scala> val p2 = new SubTypePair(intUnchecked.withoutAnnotations, intUnchecked.withoutAnnotations)
p2: $r.intp.global.SubTypePair = Int <:<? Int
scala> p1 == p2
res0: Boolean = true
scala> p1.hashCode == p2.hashCode
res1: Boolean = false
This commit switches to using `Type#==`, by way of the standard
case class equality.
The risk here is that you could find a subtyping computation that
progresses in such a manner that we don't detect the cycle. It would
need to produce an infinite stream of representations for types that
were `=:=` but not `==`. If that happened, we'd fail to terminate,
rather than judging the relationship as `false`.
[1] http://research.microsoft.com/pubs/64041/fool2007.pdf
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Taken from "On Decidability of Nominal Subtyping with Variance"
(Pierce, Kennedy), which was implemented in 152563b.
Part of the implementation (SubTypePair) will be changed in the
following commit to fix the non-deterministic errors typechecking
heavily nested types involving aliases or annotations.
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reshuffles names for blackbox/whitebox contexts, changes bundle notation
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As per Jason’s feedback, this commit handles overloaded constructors
in macro bundles. The backend now checks that we have a constructor of
a correct type. The frontend now prohibits multiple constructors altogether.
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Adjusts bundle notation to read `class Bundle(val c: Context)` instead of
`class Bundle extends Macro`. This avoids calling compileLate in the
macro compiler and associated tooling problems.
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Performs the following renamings:
* scala.reflect.macros.BlackboxContext to scala.reflect.macros.blackbox.Context
* scala.reflect.macros.BlackboxMacro to scala.reflect.macros.blackbox.Macro
* scala.reflect.macros.WhiteboxContext to scala.reflect.macros.whitebox.Context
* scala.reflect.macros.WhiteboxMacro to scala.reflect.macros.whitebox.Macro
https://groups.google.com/forum/#!topic/scala-internals/MX40-dM28rk
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Improves name-based patmat.
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The advent of the named based pattern matcher brought with it
a change in the way we determine the type of the value in the
"match monad". We used to take the base type to `Option` or `Seq`
(guided by the method name in `unapply` vs `unapplySeq`), and
simply use the type argument.
Name-based patmat, instead, uses the result type of methods in the
type. For example, the element type of an Option-like extractor
result is given by the result type of the no-args `get` method.
This approach, however, swiftly runs aground when navigating the
existential atolls. Here's why:
scala> class F[_]
defined class F
scala> val tp = typeOf[Some[F[X]] forSome { type X }]
warning: there were 1 feature warning(s); re-run with -feature for details
tp: $r.intp.global.Type = scala.this.Some[F[X]] forSome { type X }
scala> tp.baseType(typeOf[Option[_]].typeSymbol).typeArgs.head
res10: $r.intp.global.Type = F[X] forSome { type X }
scala> tp.memberType(tp.member(nme.get)).finalResultType
res11: $r.intp.global.Type = F[X]
`res10` corresponds to 2.10.x approach in `matchMonadResult`.
`res11` corresponds to the new approach in `resultOfMatchingMethod`.
The last result is not wrapped by the existential type. This results
in errors like (shown under -Ydebug to turn un accurate printing of
skolems):
error: error during expansion of this match (this is a scalac bug).
The underlying error was: type mismatch;
found : _$1&0 where type _$1&0
required: _$1
(0: Any) match {
^
one error found
This commit addresses the regression in 2.10.x compatible extractors
by using the 2.10 approach for them.
The residual problem is shown in the enclosed pending test.
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Test case for SI-8045, fixed by the preceding commits.
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Name-based pattern matcher needed some hardening against
unapply methods with the right name but wrong types. Only
isEmpty methods which return Boolean are acceptable.
Catching it directly rather than indirectly also allowed
for better error messages.
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This emerges from a recent attempt to eliminate pattern matcher
related duplication and to bake the scalac-independent logic
out of it. I had in mind something a lot cleaner, but it was
a whole lot of work to get it here and I can take it no further.
Key file to admire is PatternExpander.scala, which should
provide a basis for some separation of concerns.
The bugs addressed are a CCE involving Tuple1 and an imprecise
warning regarding multiple pattern crushing.
Editorial: auto-tupling unapply results was a terrible idea which
should never have escaped from the crib. It is tantamount to
purposely throwing type safety down the toilet in the very place
where people need type safety the most. See SI-6111 and SI-6675 for
some other comments.
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SI-8046 BaseTypeSeq fixes with aliases
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We can only compute the base type sequence (BTS) of a `TypeRef` by
element-wise transforming the BTS of the referenced symbol if
there are no abstract types in its BTS type symbols.
In the now-working test case, `pos/t8046.scala`, the difference
between the old and new calculation of the BTS is:
this = Three.this.Alias[Int]
sym.info.baseTypeSeq = BTS(One.this.Op[A],Any)
mapped BTS = BTS(Three.this.Op[Int],Any)
full BTS = BTS(Three.this.Op[Int],Int => Int,Object,Any)
The change to account for PolyType in ArgsTypeRef#transform is now
needed to avoid the full BTS of:
BTS(Three.this.Op[A],A => A,Object,Any)
Interestingly, everything actually works without that change.
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SI-2066 Plug a soundness hole higher order type params, overriding
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PolyType-s parameterized by higher order type parameters (HOTPs)
should only be relatable with <:< or =:= if the variances of their
type parameters line up. This is only enforced for HOTPs defined in
method type arguments.
Invariant type parameters subsume variant ones. Concretely, as
described by @S11001001:
> A method taking [F[_]] can implement a method taking [F[+_]].
> Likewise, a method taking [F[_[+_]]] can implement a method
> taking [F[_[_]]], as with [F[_[_[_]]]] implementing [F[_[_[+_]]]],
> and so on, the variance subsumption flipping at each step.
>
> This is just the opposite of the variance for passing type
> parameters to either instantiate types or call methods; a F[+_]
> is a suitable F[_]-argument, a F[_[_]] a suitable F[_[+_]]-argument,
> and so on.
>
> All of the above rules can be duplicated for contravariant positions
> by substituting - for +. Also, something similar happens for
> weakening/strengthening bounds, I believe.
These cases are tested in the `// okay` lines in `neg/t2066.scala`.
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fixes run/macroPlugins-namerHooks.scala
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Makes run/macroPlugins-namerHooks.scala work equally well on both
Unix and Windows machines.
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SI-8131 Move test for reflection thread safety to pending.
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Examples noted in SI-8131 show that race conditions still abound.
This has been noted twice during pull request validation.
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This PR (https://github.com/scala/scala/pull/3275#issuecomment-31986434)
demonstrates that the test is flaky.
The disabled test was introduced with the intent of preventing a
regression (here is the commit
https://github.com/scala/scala/commit/ccacb06c4928fd6aebc2c2539d7565cb079dc625).
It looks like there is a race condition when `askTypeAt(pos)` is called
on `implicitly[Foo[A]].foo` where `pos` is matches the end point of the
former expression. The issue is that the returned Tree is unattributed,
which is why the error "No symbol is associated with tree
implicitly[Foo[A]].foo" is reported.
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Fix SI-7443 Range.sum ignoring Numeric argument and always assuming default 'plus' implementation
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Previously both Range and NumeriRange used formula for sum of elements
of arithmetic series and thus always assumed that provided Numeric is
regular one.
Bug is now fixed by conservatively checking if Numeric is one of
default ones and the formula still holds.
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Presentation compiler friendliness for macros
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The presentation compiler is primarily interested in trees that
represent the code that one sees in the IDE, not the expansion of
macros.
This commit continues to expand macros, but adds a hook in which
the presentation compiler discards the expansion, retaining instead
the expandee. The expandee is attributed with the type of the
expansion, which allows white box macros to work. In addition,
any domain specific errors and warnings issued by the macro will
still be reported, as a side-effect of the expansion.
The failing test from the last commit now correctly resolves
hyperlinks in macro arguments.
Related IDE ticket:
https://www.assembla.com/spaces/scala-ide/tickets/1001449#
This facility is configured as follows:
// expand macros as per normal
-Ymacro-expand:normal
// don't expand the macro, takes the place of -Ymacro-no-expand
-Ymacro-expand:none
// expand macros to compute type and emit warnings,
// but retain expandee. Set automatically be the presentation
// compiler
-Ymacro-expand:discard
This leaves to door ajar for a new option:
// Don't expand blackbox macros; expand whitebox
// but retain expandee
-Ymacro-expand:discard-whitebox-only
The existing test for SI-6812 has been duplicated. One copy exercises
the now-deprecated -Ymacro-no-expand, and the other uses the new
option.
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- Replace NoPosition with the focus of the macro application
- Focus all range positions, for example, those of spliced arguments
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Currently, the presentation compiler sees the expansion of macros;
this no longer contains the trees corresponding to the macro arguments,
and hyperlink requests result incorrect results.
https://www.assembla.com/spaces/scala-ide/tickets/1001449#
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ExistentialTypeTree.whereClauses are now MemberDefs
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