Handles programmable member selections of
Dynamic instances and values
with structural types. Two functionalities:
- Translates selection that does not typecheck according to the scala.Dynamic rules: foo.bar(baz) = quux ~~> foo.selectDynamic(bar).update(baz, quux) foo.bar = baz ~~> foo.updateDynamic("bar")(baz) foo.bar(x = bazX, y = bazY, baz, ...) ~~> foo.applyDynamicNamed("bar")(("x", bazX), ("y", bazY), ("", baz), ...) foo.bar(baz0, baz1, ...) ~~> foo.applyDynamic(bar)(baz0, baz1, ...) foo.bar ~~> foo.selectDynamic(bar)
The first matching rule of is applied.
- Translates member selections on structural types to calls of
Selectableinstance. @See handleStructural.
Lifter for eta expansion
An enumeration controlling the degree of forcing in "is-dully-defined" checks.
Info relating to implicits that is kept for one run
The implicit resolution part of type checking
Info relating to an import clause
Produces an inlined version of
call via its
Lift all impure or complex arguments
Lift all impure arguments
Lift all impure or complex arguments to
A class that handles argument lifting. Argument lifting is needed in the following scenarios: - eta expansion - applications with default arguments - applications with out-of-order named arguments Lifting generally lifts impure expressions only, except in the case of possible default arguments, where we lift also complex pure expressions, since in that case arguments can be duplicated as arguments to default argument methods.
This class creates symbols from definitions and imports and gives them lazy types.
During enter, trees are expanded as necessary, populating the expandedTree map. Symbols are created, and the symOfTree map is set up.
Symbol completion causes some trees to be already typechecked and typedTree entries are created to associate the typed trees with the untyped expanded originals.
During typer, original trees are first expanded using expandedTree. For each expanded member definition or import we extract and remove the corresponding symbol from the symOfTree map and complete it. We then consult the typedTree map to see whether a typed tree exists already. If yes, the typed tree is returned as result. Otherwise, we proceed with regular type checking.
The scheme is designed to allow sharing of nodes, as long as each duplicate appears in a different method.
No lifting at all
A version of Typer that keeps all symbols defined and referenced in a previously typed tree.
All definition nodes keep their symbols. All leaf nodes for idents, selects, and TypeTrees keep their types. Indexing is a no-op.
Otherwise, everything is as in Typer.
Records the history of currently open implicit searches
A set of term references where equality is =:=
check method to check that all top-level definitions
in tree are variance correct. Does not recurse inside methods.
The method should be invoked once for each Template.