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putting in a nutshell, this patch:
* condenses some macro-XXX-a/b/c/... bundles
* renames some tests to prepare for other macro flavors
* introduces some additional tests
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Type tag factory used to evaluate the provided type creator in the
context of the initial mirror in order to maintain referential equality
of instances of standard tags. Unfortunately this evaluation might fail
if the mirror provided doesn't contain the classes being referred to.
Therefore I think we should avoid evaluating type creators there.
Note that failure of evaluation doesn't mean that there's something
bad going on. When one creates a type tag, the correct mirror /
classloader to interpret that tag in might be unknown (like it happens
here). This is okay, and this is exactly what the 2.10.0-M4 refactoring
has addressed.
Something like `res2.typeTag[A].in(currentMirror)` should be okay.
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This brings all the files into line with the .gitattributes
settings, which should henceforth be automatically maintained
by git.
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The new name for AbsTypeTag was a matter of a lengthy discussion:
http://groups.google.com/group/scala-internals/browse_thread/thread/fb2007e61b505c4d
I couldn't decide until having fixed SI-6323 today, which is about
trying to reflect against a local class using typeOf.
The problem with local classes is that they aren't pickled, so their metadata
isn't preserved between Scala compilation runs. Sure, we can restore some of
that metadata with Java reflection, but you get the idea.
Before today typeOf of a local class created a free type, a synthetic symbol,
with a bunch of synthetic children that remember the metadata, effectively
creating a mini symbol table. That might be useful at time, but the problem is
that this free type cannot be reflected, because the global symbol table of
Scala reflection doesn't know about its mini symbol table.
And then it struck me. It's not the presence of abs types (type parameters and
abs type members) that differentiates arbitrary type tags from good type tags.
It's the presence of types that don't map well on the runtime world - ones that
can't be used to instantiate values, ones that can't be reflected.
So we just need a name for these types. Phantom types are compile-time only
concept, whereas our types can have partial correspondence with the runtime.
"Weak types" sound more or less okish, so let's try them out.
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This protects everyone from the confusion caused by stuff like this:
https://issues.scala-lang.org/browse/SI-5884
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Implements SIP 16: Self-cleaning macros: http://bit.ly/wjjXTZ
Features:
* Macro defs
* Reification
* Type tags
* Manifests aliased to type tags
* Extended reflection API
* Several hundred tests
* 1111 changed files
Not yet implemented:
* Reification of refined types
* Expr.value splicing
* Named and default macro expansions
* Intricacies of interaction between macros and implicits
* Emission of debug information for macros (compliant with JSR-45)
Dedicated to Yuri Alekseyevich Gagarin
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