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Fix #9886: Disallow by-name trait parameters #10324

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Merged
merged 1 commit into from
Nov 16, 2020
Merged

Fix #9886: Disallow by-name trait parameters #10324

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5 changes: 5 additions & 0 deletions compiler/src/dotty/tools/dotc/ast/Desugar.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -428,6 +428,11 @@ object desugar {
}
else originalTparams

if mods.is(Trait) then
for vparams <- originalVparamss; vparam <- vparams do
if vparam.tpt.isInstanceOf[ByNameTypeTree] then
report.error(em"implementation restriction: traits cannot have by name parameters", vparam.srcPos)

// Annotations on class _type_ parameters are set on the derived parameters
// but not on the constructor parameters. The reverse is true for
// annotations on class _value_ parameters.
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2 changes: 2 additions & 0 deletions tests/neg/i9886.scala
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@@ -0,0 +1,2 @@
trait D(l: => Any): // error
def f = l