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Diffstat (limited to 'src/dotty/tools/dotc/core/Constraint.scala')
| -rw-r--r-- | src/dotty/tools/dotc/core/Constraint.scala | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/dotty/tools/dotc/core/Constraint.scala b/src/dotty/tools/dotc/core/Constraint.scala index 64fb8764e..d3d19ec30 100644 --- a/src/dotty/tools/dotc/core/Constraint.scala +++ b/src/dotty/tools/dotc/core/Constraint.scala @@ -66,7 +66,10 @@ class Constraint(val myMap: SimpleMap[PolyType, Array[Type]]) extends Showable { def typeVarOfParam(param: PolyParam): Type = { val entries = myMap(param.binder) if (entries == null) NoType - else typeVar(entries, param.paramNum) + else { + val tvar = typeVar(entries, param.paramNum) + if (tvar != null) tvar else NoType + } } /** A new constraint which is derived from this constraint by adding or replacing |