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package dotty.tools
package dotc
package core
import Types._
import Flags._
import Contexts._
import util.SimpleMap
class TyperState extends DotClass {
/** The current constraint set */
def constraint: Constraint = new Constraint(SimpleMap.Empty)
/** The currently uninstantiated TypeVars */
def undetVars: List[TypeVar] = Nil
/** The currently outstanding errors, warnings, or infos */
def diagnostics: List[Diagnostic] = Nil
def constraint_=(c: Constraint): Unit = {}
def undetVars_=(vs: List[TypeVar]): Unit = unsupported("undetVars_=")
def diagnostics_=(ds: List[Diagnostic]): Unit = unsupported("diagnostics_=")
def fresh: TyperState = this
}
class MutableTyperState (previous: TyperState) extends TyperState {
private var myConstraint: Constraint = previous.constraint
private var myUndetVars: List[TypeVar] = previous.undetVars
private var myDiagnostics: List[Diagnostic] = Nil
override def constraint = myConstraint
override def undetVars = myUndetVars
override def diagnostics = myDiagnostics
override def constraint_=(c: Constraint) = myConstraint = c
override def undetVars_=(vs: List[TypeVar]) = myUndetVars = vs
override def diagnostics_=(ds: List[Diagnostic]) = myDiagnostics = ds
override def fresh: TyperState = new MutableTyperState(this)
}
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