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| author | Martin Odersky <odersky@gmail.com> | 2014-01-13 14:39:13 +0100 |
|---|---|---|
| committer | Martin Odersky <odersky@gmail.com> | 2014-01-13 14:39:26 +0100 |
| commit | 620359dc261c12456519c142e3a6e9842f750989 (patch) | |
| tree | 56c85f5b2e0b1da1eeb720ed7d4a9b5ba04e67a0 /src/dotty/tools/dotc/core/Constraint.scala | |
| parent | 12983c39486b3759028502125944f09d62267e83 (diff) | |
| download | dotty-620359dc261c12456519c142e3a6e9842f750989.tar.gz dotty-620359dc261c12456519c142e3a6e9842f750989.tar.bz2 dotty-620359dc261c12456519c142e3a6e9842f750989.zip | |
When instantiating a type var, need to map back from polyparams to typevars.
Diffstat (limited to 'src/dotty/tools/dotc/core/Constraint.scala')
| -rw-r--r-- | src/dotty/tools/dotc/core/Constraint.scala | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/dotty/tools/dotc/core/Constraint.scala b/src/dotty/tools/dotc/core/Constraint.scala index 8704a35d8..b47cc921c 100644 --- a/src/dotty/tools/dotc/core/Constraint.scala +++ b/src/dotty/tools/dotc/core/Constraint.scala @@ -59,6 +59,15 @@ class Constraint(val myMap: SimpleMap[PolyType, Array[Type]]) extends AnyVal wit */ def bounds(param: PolyParam): TypeBounds = at(param).asInstanceOf[TypeBounds] + /** The type variable corresponding to parameter `param`, or + * NoType, if `param` is not in constrained or is not paired with a type variable. + */ + def typeVarOfParam(param: PolyParam): Type = { + val entries = myMap(param.binder) + if (entries == null) NoType + else typeVar(entries, param.paramNum) + } + /** A new constraint which is derived from this constraint by adding or replacing * the entries corresponding to `pt` with `entries`. */ |