First step towards Typer Reorganization.

Goal is better modularization and avoiding code duplication and divergence between Typer and tpd. As a first step, we split Inferencing into Inferencing, Checking, and ProtoTypes. Inferencing and Checking become Typer traits, while ProtoTypes remains a global object.

Eventually:

 - we want to have a SimpleTyper, which does the main stuff in tpd, and can mixin either full checking or no checking. Each method in SimpleTyper takes an untyped tree (which is assumed to have typed arguments) and adds a toplevel type to that tree. The methods subsume the type-checking parts in Typers, except for
(1) simplifications and expansions (2) computing prototypes and recursing with them into childtrees (3) adaptation. The method calls the necessary checking operations, which may however be stubbed out.

The idea is already exercised in the typechecking code for Literal and New, except that for now it calls methods in tpd (they will become methods in SimpleTyper instead).

 - Typer should inherit from SimpleTyper, and forward all logic except for (1) - (3) to it.

 - tpd should call the simple typer it gets from ctx.typer

 - ctx.typer should be a SimpleTyper, not a complete one.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/dotty/tools/dotc/typer/Namer.scala b/src/dotty/tools/dotc/typer/Namer.scala
index 463b7e71e..7d1e0629e 100644
--- a/src/dotty/tools/dotc/typer/Namer.scala
+++ b/src/dotty/tools/dotc/typer/Namer.scala
@@ -7,7 +7,7 @@ import ast._
 import Trees._, Constants._, StdNames._, Scopes._, Denotations._
 import Contexts._, Symbols._, Types._, SymDenotations._, Names._, NameOps._, Flags._, Decorators._
 import ast.desugar, ast.desugar._
-import Inferencing._
+import ProtoTypes._
 import util.Positions._
 import util.{Attachment, SourcePosition, DotClass}
 import collection.mutable