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Add dependent function types #3464

merged 13 commits into from Nov 27, 2017

Dependent function types may not be implicit

For the moment we want to rule this out. There are quite a lot of
bits we have to think through before we can allow this.
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odersky committed Nov 12, 2017
commit 382e4cefe09972bf4e40e99f795dab823d91b65a
@@ -1328,7 +1328,7 @@ object Types {
val funType = defn.FunctionOf(
formals1 mapConserve (_.underlyingIfRepeated(mt.isJavaMethod)),
mt.nonDependentResultApprox, mt.isImplicitMethod && !ctx.erasedTypes)
if (mt.isDependent) RefinedType(funType, nme.apply, mt)
if (mt.isDependent && !mt.isImplicitMethod) RefinedType(funType, nme.apply, mt)
else funType
@@ -719,10 +719,12 @@ class Typer extends Namer with TypeAssigner with Applications with Implicits wit
val params1 =[ValDef])
val resultTpt = typed(body)
val companion = if (isImplicit) ImplicitMethodType else MethodType
val mt = companion.fromSymbols(, resultTpt.tpe)
val mt = MethodType.fromSymbols(, resultTpt.tpe)
if (mt.isParamDependent)
ctx.error(i"$mt is an illegal function type because it has inter-parameter dependencies")
ctx.error(i"$mt is an illegal function type because it has inter-parameter dependencies", tree.pos)
if (isImplicit)
ctx.error(i"dependent function type $mt may not be implicit", tree.pos)
val resTpt = TypeTree(mt.nonDependentResultApprox).withPos(body.pos)
val typeArgs = :+ resTpt
val tycon = TypeTree(funCls.typeRef)
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