diff options
Diffstat (limited to 'src/dotty/tools/dotc/core/Types.scala')
| -rw-r--r-- | src/dotty/tools/dotc/core/Types.scala | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/dotty/tools/dotc/core/Types.scala b/src/dotty/tools/dotc/core/Types.scala index 6145bdffb..d93e4eb09 100644 --- a/src/dotty/tools/dotc/core/Types.scala +++ b/src/dotty/tools/dotc/core/Types.scala @@ -1173,7 +1173,12 @@ object Types { else loadDenot } if (ctx.typerState.ephemeral) record("ephemeral cache miss: loadDenot") - else { + else if (d.exists) { + // Avoid storing NoDenotations in the cache - we will not be able to recover from + // them. The situation might arise that a type has NoDenotation in some later + // phase but a defined denotation earlier (e.g. a TypeRef to an abstract type + // is undefined after erasure.) We need to be able to do time travel back and + // forth also in these cases. lastDenotation = d lastSymbol = d.symbol checkedPeriod = ctx.period |