Fix #4297: handle type param reference #4298
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| case tp: TypeRef if tp.underlying.isInstanceOf[TypeBounds] => | ||
| val lo = this(tp.info.loBound) | ||
| val hi = this(tp.info.hiBound) | ||
| if (variance == 0) range(lo, hi) |
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The range method already does variance checks like this.
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test performance with #fast please |
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performance test scheduled: 1 job(s) in queue, 0 running. |
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Performance test finished successfully: Visit http://dotty-bench.epfl.ch/4298/ to see the changes. Benchmarks is based on merging with master (7b91742) |
| def apply(tp: Type): Type = tp match { | ||
| case tp: TypeRef if tp.underlying.isInstanceOf[TypeBounds] => | ||
| val lo = this(tp.info.loBound) | ||
| val hi = this(tp.info.hiBound) |
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Replace this by apply? It makes it clearer that this is a recursive call
| case tpe: AppliedType => isClassDetermined(X, tpe)(ctx.fresh.setNewTyperState()) | ||
| case tpe: AppliedType => | ||
| isClassDetermined(X, tpe)(ctx.fresh.setNewTyperState()) || | ||
| isClassDetermined(stripTypeParam.apply(X), tpe)(ctx.fresh.setNewTyperState()) |
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Call it as stripTypeParam(X) instead of stripTypeParam.apply(X)?
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It seems scalac has problem with this syntax, however, I've changed the method so we don't need to call apply anymore.
| } | ||
| case tpe: AppliedType => isClassDetermined(X, tpe)(ctx.fresh.setNewTyperState()) | ||
| case tpe: AppliedType => | ||
| isClassDetermined(X, tpe)(ctx.fresh.setNewTyperState()) || |
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Here, you first try without stripping type parameters for performance reasons? Maybe add a comment
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| def stripTypeParam(implicit ctx: Context) = new ApproximatingTypeMap { | ||
| def apply(tp: Type): Type = tp match { | ||
| case tp: TypeRef if tp.underlying.isInstanceOf[TypeBounds] => |
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Probably equivalent to case tp: TypeRef if tp.symbol.isTypeParam. Maybe clearer?
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tp.symbol.isTypeParam doesn't cover the case of type members, so I think it's better to keep the original version here.
| } | ||
| } | ||
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| def stripTypeParam(implicit ctx: Context) = new ApproximatingTypeMap { |
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Maybe add a comment: /** Approximate type parameters depending on variance */
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Fix #4297: handle type param reference