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Drop tree node class 'Pair'. It was used only in imports, where
it can easily be replaced by Thicket.
The envisaged use for generic pairs is almost sure better modelled
by a "Pair" class in Dotty's standard library.
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Two of these are unavoidable. I moved the tests to diabled/not-representable
and added in each case a comment to the main scala file detailing why there
is a deviation.
The last one (import-rewrite) is fixed.
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Symbols are not stable between runs, so if some symbol referred
to from Definitions gets recompiled, there are then two Symbols
that are both visible, one referenced from Definitions, the other
the one that got compiled.
Thos led to a crash when e.g. compiling scala.Short, because the
newly compiled symbol was not recognized as a primitive value
class.
The present commit tries to make systematic changes without regard
to simplicity or aesthetics. This will be polished in future commits.
// ### comments signal areas that need further attention.
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Can now compile Predef/DottyPredef without -Yno-import option.
Achieved by making some parts of imports more lazy.
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- Some types are different when erased (e.g. prefixes are NoPrefix)
- Some types are forbidden when erased. Put in assertions to check that fact.
Also, some renaming and doc comments to make creation of TermRefs and TypeRefs
clearer.
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- Some new functionality in tpd and in Symbols.
- Added `sm` interpolator to print nicely.
- Make use of nestedMap where possible.
- Add IdentityDenotTransformer as a convencience class
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remove all isSensical/SuppressedMessage logic from InfoString
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some nested import.
This also changes the criterion when a root import is disabled.
A root import is now disabled if there is an inner import from the same package or module, and the inner import contains at least one disabling clause X => _. (The latter crierion is new; without it, we would consider something like
import scala.{collections => c}
as a hiding import for Scala, which seems to go too far.)
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1. We forgot to mark declaration symbols Deferred.
2. Types with NoPrefix and the same name got identified. Fixed by adding a new category WithNoPrefix to named types, and changing the way named types get generated.
3. Self types lacked parameters. (Question: Do we need to also track type members?)
4. Printers caused cyclic reference errors. Now some print operations are more careful with forcing.
5. Namedparts accumulator has to be more careful with ThisTypes. Because self types now contain parameters, which might lead back to this, we only add the class name (or the source module, if it's a module class).
6. toBounds in TypeApplications needs to use Co/Contra aliases for expanded name parameters, not just local ones.
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Fixed a problem where an import and a definition in same scope were erroneously regarded as a conflict (L20 in typedIdents.scala)
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New operations:
- typeRef
- termRef
- valRef (like termRef, but with NotAMethod signature)
- termRefWithSig (like termRef, but with denotation's signature)
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Previously, plain TermRefs had signature NotAMethod. The problem is if the TermRef represents an overloaded term and one of the alternatives is NotAMethod. Then creating the alternative will overwrite (via hash-consing) the overloaded ref.
Solution: Introduc new pseudo-signature "UnknownSignature" which is given to plain TermRefs. Also, need to be careful now that all members that denote a specific alternative of a possibly overloaded denotation are referenced by a TermRefWithSig, not a plain TermRef. Previously, implicit members did not follow that, which meant that, what worked, worked only by accident.
Still to do: Clean up signatures, termref creation methods. Should TermRef.withDenot automatically set the signature?
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Plus a few bugfixes for implicits
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… and cleaned up and simplified other context-reated features.
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one is given for the same package or object.
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- Pushed mode into context
- Elimintaed scope nesting level
- Fixed a desugar bug
- Added constant folding
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Still to do:
- properly account for bounded wildcard types
- set up scheme for nested diagnostics buffers.
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Also some refactorings that were caused by adding this method.
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