diff options
Diffstat (limited to 'src/dotty/tools/dotc/typer/Checking.scala')
| -rw-r--r-- | src/dotty/tools/dotc/typer/Checking.scala | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/src/dotty/tools/dotc/typer/Checking.scala b/src/dotty/tools/dotc/typer/Checking.scala index 0b4787d15..3a55352fd 100644 --- a/src/dotty/tools/dotc/typer/Checking.scala +++ b/src/dotty/tools/dotc/typer/Checking.scala @@ -318,9 +318,18 @@ trait Checking { } /** Check that type `tp` is stable. */ - def checkStable(tp: Type, pos: Position)(implicit ctx: Context): Unit = - if (!tp.isStable && !tp.isErroneous) - ctx.error(d"$tp is not stable", pos) + def checkStableAndRealizable(tp: Type, pos: Position)(implicit ctx: Context): Unit = + if (!tp.isStable) ctx.error(d"$tp is not stable", pos) + else checkRealizable(tp, pos) + + /** Check that type `tp` is realizable. */ + def checkRealizable(tp: Type, pos: Position)(implicit ctx: Context): Unit = { + val rstatus = tp.realizability + if (rstatus ne Realizable) { + def msg = d"$tp is not a legal path since it ${rstatus.msg}" + if (ctx.scala2Mode) ctx.migrationWarning(msg, pos) else ctx.error(msg, pos) + } + } /** Check that `tp` is a class type with a stable prefix. Also, if `traitReq` is * true check that `tp` is a trait. @@ -330,7 +339,7 @@ trait Checking { def checkClassTypeWithStablePrefix(tp: Type, pos: Position, traitReq: Boolean)(implicit ctx: Context): Type = tp.underlyingClassRef(refinementOK = false) match { case tref: TypeRef => - if (ctx.phase <= ctx.refchecksPhase) checkStable(tref.prefix, pos) + if (ctx.phase <= ctx.refchecksPhase) checkStableAndRealizable(tref.prefix, pos) if (traitReq && !(tref.symbol is Trait)) ctx.error(d"$tref is not a trait", pos) tp case _ => @@ -433,7 +442,8 @@ trait NoChecking extends Checking { import tpd._ override def checkNonCyclic(sym: Symbol, info: TypeBounds, reportErrors: Boolean)(implicit ctx: Context): Type = info override def checkValue(tree: Tree, proto: Type)(implicit ctx: Context): tree.type = tree - override def checkStable(tp: Type, pos: Position)(implicit ctx: Context): Unit = () + override def checkStableAndRealizable(tp: Type, pos: Position)(implicit ctx: Context): Unit = () + override def checkRealizable(tp: Type, pos: Position)(implicit ctx: Context): Unit = () override def checkClassTypeWithStablePrefix(tp: Type, pos: Position, traitReq: Boolean)(implicit ctx: Context): Type = tp override def checkImplicitParamsNotSingletons(vparamss: List[List[ValDef]])(implicit ctx: Context): Unit = () override def checkFeasible(tp: Type, pos: Position, where: => String = "")(implicit ctx: Context): Type = tp |