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One step towards teasing apart the mixin phase, making
each phase that adds members to traits responsible for
mixing in those members into subclasses of said traits.
Another design tenet is to not emit symbols or trees
only to later remove them. Therefore, we model a
val in a trait as its accessor. The underlying field
is an implementation detail. It must be mixed into
subclasses, but has no business in a trait (an interface).
Also trying to reduce tree creation by changing less in subtrees
during tree transforms.
A lot of nice fixes fall out from this rework:
- Correct bridges and more precise generic signatures for
mixed in accessors, since they are now created before erasure.
- Correct enclosing method attribute for classes nested in trait fields.
Trait fields are now created as MethodSymbol (no longer TermSymbol).
This symbol shows up in the `originalOwner` chain of a class declared
within the field initializer. This promoted the field getter to
being the enclosing method of the nested class, which it is not
(the EnclosingMethod attribute is a source-level property).
- Signature inference is now more similar between vals and defs
- No more field for constant-typed vals, or mixed in accessors
for subclasses. A constant val can be fully implemented in a trait.
TODO:
- give same treatment to trait lazy vals (only accessors, no fields)
- remove support for presuper vals in traits
(they don't have the right init semantics in traits anyway)
- lambdalift should emit accessors for captured vals in traits,
not a field
Assorted notes from the full git history before squashing below.
Unit-typed vals: don't suppress field
it affects the memory model -- even a write of unit to a field is relevant...
unit-typed lazy vals should never receive a field
this need was unmasked by test/files/run/t7843-jsr223-service.scala,
which no longer printed the output expected from the `0 to 10 foreach`
Use getter.referenced to track traitsetter
reify's toolbox compiler changes the name of the trait
that owns the accessor between fields and constructors (`$` suffix),
so that the trait setter cannot be found when doing mkAssign in constructors
this could be solved by creating the mkAssign tree immediately during fields
anyway, first experiment: use `referenced` now that fields runs closer
to the constructors phase (I tried this before and something broke)
Infer result type for `val`s, like we do for `def`s
The lack of result type inference caused pos/t6780 to fail
in the new field encoding for traits, as there is no separate accessor,
and method synthesis computes the type signature based on the ValDef tree.
This caused a cyclic error in implicit search, because now the
implicit val's result type was not inferred from the super member,
and inferring it from the RHS would cause implicit search to consider
the member in question, so that a cycle is detected and type checking fails...
Regardless of the new encoding, we should consistently infer result types
for `def`s and `val`s.
Removed test/files/run/t4287inferredMethodTypes.scala and test/files/presentation/t4287c,
since they were relying on inferring argument types from "overridden" constructors
in a test for range positions of default arguments. Constructors don't override,
so that was a mis-feature of -Yinfer-argument-types.
Had to slightly refactor test/files/presentation/doc, as it was relying
on scalac inferring a big intersection type to approximate the anonymous
class that's instantiated for `override lazy val analyzer`.
Now that we infer `Global` as the expected type based on the overridden val,
we make `getComment` private in navigating between good old Skylla and Charybdis.
I'm not sure why we need this restriction for anonymous classes though;
only structural calls are restricted in the way that we're trying to avoid.
The old behavior is maintained nder -Xsource:2.11.
Tests:
- test/files/{pos,neg}/val_infer.scala
- test/files/neg/val_sig_infer_match.scala
- test/files/neg/val_sig_infer_struct.scala
need NMT when inferring sig for accessor
Q: why are we calling valDefSig and not methodSig?
A: traits use defs for vals, but still use valDefSig...
keep accessor and field info in synch
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This commit corrects many typos found in scaladocs, comments and
documentation. It should reduce a bit number of PRs which fix one
typo.
There are no changes in the 'real' code except one corrected name of
a JUnit test method and some error messages in exceptions. In the case
of typos in other method or field names etc., I just skipped them.
Obviously this commit doesn't fix all existing typos. I just generated
in IntelliJ the list of potential typos and looked through it quickly.
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It turns out `findMembers` has been a bit sloppy in recent
years and has returned private members from *anywhere* up the
base class sequence. Access checks usually pick up the slack
and eliminate the unwanted privates.
But, in concert with the "concrete beats abstract" rule in
`findMember`, the following mishap appeared:
scala> :paste
// Entering paste mode (ctrl-D to finish)
trait T { def a: Int }
trait B { private def a: Int = 0 }
trait C extends T with B { a }
// Exiting paste mode, now interpreting.
<console>:9: error: method a in trait B cannot be accessed in C
trait C extends T with B { a }
^
I noticed this when compiling Akka against JDK 8; a new private method
in the bowels of the JDK was enough to break the build!
It turns out that some finesse in needed to interpret SLS 5.2:
> The private modifier can be used with any definition or declaration
> in a template. They are not inherited by subclasses [...]
So, can we simply exclude privates from all but the first base class?
No, as that might be a refinement class! The following must be
allowed:
trait A { private def foo = 0; trait T { self: A => this.foo } }
This commit:
- tracks when the walk up the base class sequence passes the
first non-refinement class, and excludes private members
- ... except, if we are at a direct parent of a refinement
class itself
- Makes a corresponding change to OverridingPairs, to only consider
private members if they are owned by the `base` Symbol under
consideration. We don't need to deal with the subtleties of
refinements there as that code is only used for bona-fide classes.
- replaces use of `hasTransOwner` when considering whether a
private[this] symbol is a member.
The last condition was not grounded in the spec at all. The change
is visible in cases like:
// Old
scala> trait A { private[this] val x = 0; class B extends A { this.x } }
<console>:7: error: value x in trait A cannot be accessed in A.this.B
trait A { private[this] val x = 0; class B extends A { this.x } }
^
// New
scala> trait A { private[this] val x = 0; class B extends A { this.x } }
<console>:8: error: value x is not a member of A.this.B
trait A { private[this] val x = 0; class B extends A { this.x } }
^
Furthermore, we no longer give a `private[this]` member a free pass
if it is sourced from the very first base class.
trait Cake extends Slice {
private[this] val bippy = ()
}
trait Slice { self: Cake =>
bippy // BCS: Cake, Slice, AnyRef, Any
}
The different handling between `private` and `private[this]`
still seems a bit dubious.
The spec says:
> An different form of qualification is private[this]. A member M
> marked with this modifier can be accessed only from within the
> object in which it is defined. That is, a selection p.M is only
> legal if the prefix is this or O.this, for some class O enclosing
> the reference. In addition, the restrictions for unqualified
> private apply.
This sounds like a question of access, not membership. If so, we
should admit `private[this]` members from parents of refined types
in `FindMember`.
AFAICT, not too much rests on the distinction: do we get a
"no such member", or "member foo inaccessible" error? I welcome
scrutinee of the checkfile of `neg/t7475f.scala` to help put
this last piece into the puzzle.
One more thing: findMember does not have *any* code the corresponds
to the last sentence of:
> SLS 5.2 The modifier can be qualified with an identifier C
> (e.g. private[C]) that must denote a class or package enclosing
> the definition. Members labeled with such a modifier are accessible
> respectively only from code inside the package C or only from code
> inside the class C and its companion module (§5.4).
> Such members are also inherited only from templates inside C.
When I showed Martin this, he suggested it was an error in the
spec, and we should leave the access checking to callers of
that inherited qualified-private member.
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These regressed in e609f1f20b, which excluded all private methods from
overriding checks. We should only exclude private[this] members on the
low end of a pair, as was done before that commit, and, we must also
exclude private members on the high side.
Why? Warning: reverse engineered intuition follows.
We need to report an error when if a private method in a subclass
has matches a less-private method in the super class and report an
error, lest the user be fooled into thinking it might be invoked
virtually. On the other hand, adding a private method to a super
class shouldn't invalidate the choice names of public members in
its superclasses.
I've removed the test case added by that commit and will lodge a
reworked version of it that Paul provided as a new issue. That shows
a bug with qualified private + inheritance.
In addition, the expectation of `neg/accesses.check` is reverted
to its 2.10.3 version, which I believe is correct. When it was
changed in e609f1f20b it sprouted a variation, `neg/accesses-2`,
which has now changed behaviour. The intent of that test will
be captured in the aforementioned issue covering qualified private
inheritance.
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Increases your chance of knowing what is going on in
OverridingPairs. Introduces some new abstractions which I
hope for your own sakes you will put to use in some way:
RelativeTo: operations relative to a prefix
SymbolPair: two symbols being compared for something, and
the enclosing class where the comparison is being performed
Fixed a minor bug with access by accident by way of more
principled pair analysis. See run/private-override.scala.
Upgraded the error message issued on certain conflicts
to give the line numbers of both conflicting methods, as
opposed to just one and you go hunting.
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With the exception of toString and the odd JavaBean getter.
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* commit 'refs/pull/1574/head': (24 commits)
Fixing issue where OSGi bundles weren't getting used for distribution.
Fixes example in Type.asSeenFrom
Fix for SI-6600, regression with ScalaNumber.
SI-6562 Fix crash with class nested in @inline method
Brings copyrights in Scaladoc footer and manpage up-to-date, from 2011/12 to 2013
Brings all copyrights (in comments) up-to-date, from 2011/12 to 2013
SI-6606 Drops new icons in, replaces abstract types placeholder icons
SI-6132 Revisited, cleaned-up, links fixed, spelling errors fixed, rewordings
Labeling scala.reflect and scala.reflect.macros experimental in the API docs
Typo-fix in scala.concurrent.Future, thanks to @pavelpavlov
Remove implementation details from Position (they are still under reflection.internal). It probably needs more cleanup of the api wrt to ranges etc but let's leave it for later
SI-6399 Adds API docs for Any and AnyVal
Removing actors-migration from main repository so it can live on elsewhere.
Fix for SI-6597, implicit case class crasher.
SI-6578 Harden against synthetics being added more than once.
SI-6556 no assert for surprising ctor result type
Removing actors-migration from main repository so it can live on elsewhere.
Fixes SI-6500 by making erasure more regular.
Modification to SI-6534 patch.
Fixes SI-6559 - StringContext not using passed in escape function.
...
Conflicts:
src/actors-migration/scala/actors/migration/StashingActor.scala
src/compiler/scala/tools/nsc/backend/jvm/GenASM.scala
src/compiler/scala/tools/nsc/settings/AestheticSettings.scala
src/compiler/scala/tools/nsc/transform/Erasure.scala
src/library/scala/Application.scala
src/library/scala/collection/immutable/GenIterable.scala.disabled
src/library/scala/collection/immutable/GenMap.scala.disabled
src/library/scala/collection/immutable/GenSeq.scala.disabled
src/library/scala/collection/immutable/GenSet.scala.disabled
src/library/scala/collection/immutable/GenTraversable.scala.disabled
src/library/scala/collection/mutable/GenIterable.scala.disabled
src/library/scala/collection/mutable/GenMap.scala.disabled
src/library/scala/collection/mutable/GenSeq.scala.disabled
src/library/scala/collection/mutable/GenSet.scala.disabled
src/library/scala/collection/mutable/GenTraversable.scala.disabled
src/library/scala/collection/parallel/immutable/ParNumericRange.scala.disabled
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* 2.10.x: (36 commits)
Normalized line endings.
New .gitattributes file.
Disabled failing build manager tests.
New test case for SI-6337
New test case for closing SI-6385
Value classes: eliminated half-boxing
Cleanup of OverridingPairs
Fixes SI-6260
Use faster download URL now that artifactory is fixed.
don't try to create tags w/o scala-reflect.jar
some small remaining fixes
SI-5943 toolboxes now autoimport Predef and scala
Fix for loud test.
SI-6363 deploys the updated starr
SI-6363 removes scala.reflect.base
SI-6392 wraps non-terms before typecheck/eval
SI-6394 fixes macros.Context.enclosingClass
Error message improvement for SI-6336.
Adjustments to scala.concurrent.duration.
prepping for the refactoring
...
Conflicts:
src/actors-migration/scala/actors/Pattern.scala
src/compiler/scala/tools/nsc/Global.scala
src/compiler/scala/tools/nsc/transform/Erasure.scala
src/compiler/scala/tools/nsc/typechecker/Typers.scala
src/library/scala/collection/immutable/Vector.scala
test/files/jvm/actmig-PinS_1.scala
test/files/jvm/actmig-PinS_2.scala
test/files/jvm/actmig-PinS_3.scala
test/files/jvm/actmig-public-methods_1.scala
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Added a default value to a hashmap so that we can work with it
without Option acrobatics.
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* origin/2.10.x: (68 commits)
Eliminate breaking relative names in source.
"Hot fix" for broken build.
Fix SI-4813 - Clone doesn't work on LinkedList.
Made 'def clone()' consistent with parens everywhere.
accommodates pull request feedback
SI-6310 redeploys the starr
SI-6310 AbsTypeTag => WeakTypeTag
SI-6323 outlaws free types from TypeTag
SI-6323 prohibits reflection against free types
improvements for reification of free symbols
removes build.newFreeExistential
SI-6359 Deep prohibition of templates in value class
Fixes SI-6259. Unable to use typeOf in super call of top-level object.
Fixes binary repo push for new typesafe repo layouts.
Better error message for pattern arity errors.
Rescued TreeBuilder from the parser.
Pending test for SI-3943
Test case for a bug fixed in M7.
Fix for SI-6367, exponential time in inference.
SI-6306 Remove incorrect eta-expansion optimization in Uncurry
...
Conflicts:
src/compiler/scala/tools/nsc/transform/AddInterfaces.scala
src/compiler/scala/tools/nsc/transform/SpecializeTypes.scala
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These things are killing me. Constructions like
package scala.foo.bar.baz
import foo.Other
DO NOT WORK in general. Such files are not really in the
"scala" package, because it is not declared
package scala
package foo.bar.baz
And there is a second problem: using a relative path name means
compilation will fail in the presence of a directory of the same
name, e.g.
% mkdir reflect
% scalac src/reflect/scala/reflect/internal/util/Position.scala
src/reflect/scala/reflect/internal/util/Position.scala:9: error:
object ClassTag is not a member of package reflect
import reflect.ClassTag
^
src/reflect/scala/reflect/internal/util/Position.scala:10: error:
object base is not a member of package reflect
import reflect.base.Attachments
^
As a rule, do not use relative package paths unless you have
explicitly imported the path to which you think you are relative.
Better yet, don't use them at all. Unfortunately they mostly work
because scala variously thinks everything scala.* is in the scala
package and/or because you usually aren't bootstrapping and it
falls through to an existing version of the class already on the
classpath.
Making the paths explicit is not a complete solution -
in particular, we remain enormously vulnerable to any directory
or package called "scala" which isn't ours - but it greatly
limts the severity of the problem.
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Required a few changes of `HIDDEN` -> `ARTIFACT` and `isHidden` -> `isArtifact`
Conflicts:
src/reflect/scala/reflect/internal/Flags.scala
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Conflicts:
src/compiler/scala/tools/nsc/ast/TreeGen.scala
src/compiler/scala/tools/nsc/settings/AestheticSettings.scala
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These are the regexp replacements performed:
Sxcala
-> Scala
Copyright (\d*) LAMP/EPFL
-> Copyright $1-2012 LAMP/EPFL
Copyright (\d*)-(\d*)(,?) LAMP/EPFL
-> Copyright $1-2012 LAMP/EPFL
Copyright (\d*)-(\d*) Scala Solutions and LAMP/EPFL
-> Copyright $1-2012 Scala Solutions and LAMP/EPFL
\(C\) (\d*)-(\d*) LAMP/EPFL
-> (C) $1-2012 LAMP/EPFL
Copyright \(c\) (\d*)-(\d*)(.*?)EPFL
-> Copyright (c) $1-2012$3EPFL
The last one was needed for two HTML-ified copyright notices.
Here's the summarized diff:
Created using
```
git diff -w | grep ^- | sort | uniq | mate
git diff -w | grep ^+ | sort | uniq | mate
```
```
- <div id="footer">Scala programming documentation. Copyright (c) 2003-2011 <a href="http://www.epfl.ch" target="_top">EPFL</a>, with contributions from <a href="http://typesafe.com" target="_top">Typesafe</a>.</div>
- copyright.string=Copyright 2002-2011, LAMP/EPFL
- <meta name="Copyright" content="(C) 2002-2011 LAMP/EPFL"/>
- * Copyright 2002-2011 LAMP/EPFL
- * Copyright 2004-2011 LAMP/EPFL
- * Copyright 2005 LAMP/EPFL
- * Copyright 2005-2011 LAMP/EPFL
- * Copyright 2006-2011 LAMP/EPFL
- * Copyright 2007 LAMP/EPFL
- * Copyright 2007-2011 LAMP/EPFL
- * Copyright 2009-2011 Scala Solutions and LAMP/EPFL
- * Copyright 2009-2011 Scxala Solutions and LAMP/EPFL
- * Copyright 2010-2011 LAMP/EPFL
- * Copyright 2012 LAMP/EPFL
-# Copyright 2002-2011, LAMP/EPFL
-* Copyright 2005-2011 LAMP/EPFL
-/* NSC -- new Scala compiler -- Copyright 2007-2011 LAMP/EPFL */
-rem # Copyright 2002-2011, LAMP/EPFL
```
```
+ <div id="footer">Scala programming documentation. Copyright (c) 2003-2012 <a href="http://www.epfl.ch" target="_top">EPFL</a>, with contributions from <a href="http://typesafe.com" target="_top">Typesafe</a>.</div>
+ copyright.string=Copyright 2002-2012 LAMP/EPFL
+ <meta name="Copyright" content="(C) 2002-2012 LAMP/EPFL"/>
+ * Copyright 2002-2012 LAMP/EPFL
+ * Copyright 2004-2012 LAMP/EPFL
+ * Copyright 2005-2012 LAMP/EPFL
+ * Copyright 2006-2012 LAMP/EPFL
+ * Copyright 2007-2012 LAMP/EPFL
+ * Copyright 2009-2012 Scala Solutions and LAMP/EPFL
+ * Copyright 2010-2012 LAMP/EPFL
+ * Copyright 2011-2012 LAMP/EPFL
+# Copyright 2002-2012 LAMP/EPFL
+* Copyright 2005-2012 LAMP/EPFL
+/* NSC -- new Scala compiler -- Copyright 2007-2012 LAMP/EPFL */
+rem # Copyright 2002-2012 LAMP/EPFL
```
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Like the comment says:
/** Symbols which are marked HIDDEN. (Expand this list?)
*
* - $outer fields and accessors
* - super accessors
* - protected accessors
* - lazy local accessors
* - bridge methods
* - default argument getters
* - evaluation-order preserving locals for right-associative and out-of-order named arguments
* - catch-expression storing vals
* - anything else which feels a setFlag(HIDDEN)
*/
I also changed a few safe-appearing locations to check isHidden
rather than isSynthetic. Review by @dragos, @odersky.
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Removed all the trailing whitespace to make eugene happier.
Will try to keep it that way by protecting at the merge level.
Left the tabs in place because they can't be uniformly changed
to spaces, some are 2, some are 4, some are 8, whee.
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An object in a subclass would silently override an inherited
method, then throw a CCE at runtime. I blamed this on matchesType
and altered it accordingly. There's a pretty extensive test case
which reflects my expectations. Review by @odersky please.
Closes SI-5429.
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The idea is that all operations that need to be synchronized are overriden in classes reflect.runtime.Synchronized*. Sometimes this applies to operations defined in SymbolTable, which can be directly overridden. Sometimes it is more convenient to generate SynchronizedClazz subclasses of SymbolTable classes Clazz. In the latter case, all instance creation must go over factory methods that can be overridden in the Synchronized traits.
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Since trunk seems to be undergoing all kinds of changes of the sort
which touch lots of files, the time is ripe for various search/replace
improvements which have stacked up. This one is the replacement of all
"if (settings.debug.value) log" with "debuglog" since as noted in a
recent commit, the inliner will take care of that for you. No review.
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Adding some Sets/Maps to perRunCaches, and eliminating ambiguously named
imports.
Did a tour of the compiler adding a few longer-lived mutable structures
to the per-run cache clearing mechanism. Some of these were not a big
threat, but there is (almost) literally no cost to tracking them and the
fewer mutable structures which are created "lone wolf style" the easier
it is to spot the one playing by his own rules.
While I was at it I followed through on long held ambition to eliminate
the importing of highly ambiguous names like "Map" and "HashSet" from
the mutable and immutable packages. I didn't quite manage elimination
but it's pretty close. Something potentially as pernicious which I
didn't do much about is this import:
import scala.collection._
Imagine coming across that one on lines 407 and 474 of a 1271 file.
That's not cool. Some poor future programmer will be on line 1100 and
use "Map[A, B]" in some function and only after the product has shipped
will it be discovered that the signature is wrong and the rocket will
now be crashing into the mountainside straightaway. No review.
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I wrote a warning when nullary methods return Unit. I wimped out of
including it in this patch because we had about 200 of them, and that's
what is fixed in this patch. I will add the warning to some kind of
"-Xlint" feature after 2.9.
This is motivated at least partly by the resolution of #4506, which
indicates the distinction between "def foo()" and "def foo" will
continue to jab its pointy stick into our eyes, so I believe we have a
minimal duty of at least following our own advice about what they mean
and not making a semirandom choice as to whether a method has parens or
not. Review by community.
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def isRootOrEmptyPackageClass(s: Symbol) = s.isRoot || s.isEmptyPackageClass
def isRootOrEmpty = (this == EmptyPackageClass) || (this == RootClass)
def isEffectiveRoot = isRoot || isEmptyPackageClass
// last one actually not quite identical
def isUnqualified(n: Name) = n match { case nme.ROOT | nme.EMPTY_PACKAGE_NAME => true ; case _ => false }
I was responsible for at least half of these. Now it's only
isEffectiveRoot.
Also, I have always found it warty that we have to specify Nothing
and Any as upper bounds. I gave the TypeBounds companion object a few
obvious methods:
def empty: TypeBounds = apply(NothingClass.tpe, AnyClass.tpe)
def upper(hi: Type): TypeBounds = apply(NothingClass.tpe, hi)
def lower(lo: Type): TypeBounds = apply(lo, AnyClass.tpe)
It's a lovable patch. No review.
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Removes a bunch of private functions which are never called. While based
on the nature of "private" one can generally feel pretty good that such
a thing is safe, there is always a chance the author had some future use
in mind. On that note I draw your attention in particular to:
(martin) Typers#stabilizedType: it "sounds" important, but most of it
has been commented out since 2007 and the little stub part is a never
called private.
(iulian) SpecializeTypes#makeTypeArguments: similarly sounds like a
cornerstone of a transformation until one notices it isn't used.
Unused methods are "attractive nuisances" for anyone (like myself) who
has to figure out how the compiler works by studying the compiler, for
reasons which are no doubt obvious. No review except as noted.
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Removed more than 3400 svn '$Id' keywords and related junk.
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As a brief diversion from real work, implemented Damerau–Levenshtein
and ran it on trunk to elicit obvious misspellings. Unfortunately
they're mostly in places like compiler comments which real people never
see, but I fixed them anyway. All those English Lit majors who peruse
our sources are sure to be pleased. No review.
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hardening the compiler to avoid exceptions I observed when used under
Eclipse.
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Fix and test case for #2512, plus lots of time expended tuning HashSet
starting sizes and growth rate, with almost nothing to show for it (but
I did determine that "shadowed" is constructed identically something
like 10,000 times, so there is probably a cache to be had there.)
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Made Cursor.next tail recursive by making it final.
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Attempting to widen the field of possibilities for equality, a proof
by construction that a large codebase doesn't need to perform equality
checks between different primitives types if it is not so inclined.
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Fixed an ambiguity problem with implcits, and a spurious cyclic
reference error mentioned by Jorge. Tightened overriding checks (test
case is new collection libraries).
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Fixed duplicate symbols problem in new collection libraries by adding
a special case to Erasure. Fixed override problems in new collection
libraries by refining OverriddenPairs. Fixed repeated load by applying
patch to Settings. Improved error message iin RefChecks.
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2. some new tests.
3. split Type.symbol to typeSymbol/termSymbol
4. some fixes to lub opertation
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allowed non-K&R style braces.
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added modifiers for primary constructors.
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