diff options
Diffstat (limited to 'src/compiler/scala/tools/nsc/typechecker/Macros.scala')
| -rw-r--r-- | src/compiler/scala/tools/nsc/typechecker/Macros.scala | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/src/compiler/scala/tools/nsc/typechecker/Macros.scala b/src/compiler/scala/tools/nsc/typechecker/Macros.scala index 57358f72f5..27920dbd74 100644 --- a/src/compiler/scala/tools/nsc/typechecker/Macros.scala +++ b/src/compiler/scala/tools/nsc/typechecker/Macros.scala @@ -678,7 +678,7 @@ trait Macros extends FastTrack with MacroRuntimes with Traces with Helpers { // e.g. for Foo it will be Int :: String :: Boolean :: HNil), there's no way to convey this information // to the typechecker. Therefore the typechecker will infer Nothing for L, which is hardly what we want. // - // =========== THE SOLUTION =========== + // =========== THE SOLUTION (ENABLED ONLY FOR WHITEBOX MACROS) =========== // // To give materializers a chance to say their word before vanilla inference kicks in, // we infer as much as possible (e.g. in the example above even though L is hopeless, C still can be inferred to Foo) @@ -686,9 +686,12 @@ trait Macros extends FastTrack with MacroRuntimes with Traces with Helpers { // Thanks to that the materializer can take a look at what's going on and react accordingly. val shouldInstantiate = typer.context.undetparams.nonEmpty && !mode.inPolyMode if (shouldInstantiate) { - forced += delayed - typer.infer.inferExprInstance(delayed, typer.context.extractUndetparams(), pt, keepNothings = false) - macroExpandApply(typer, delayed, mode, pt) + if (isBlackbox(expandee)) typer.instantiatePossiblyExpectingUnit(delayed, mode, pt) + else { + forced += delayed + typer.infer.inferExprInstance(delayed, typer.context.extractUndetparams(), pt, keepNothings = false) + macroExpandApply(typer, delayed, mode, pt) + } } else delayed } } |