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Use inferred type transformer for SeqLiterals #19472

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Merged
Linyxus merged 1 commit into from
Jan 18, 2024
Merged

Use inferred type transformer for SeqLiterals #19472

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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/cc/Setup.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -416,7 +416,7 @@ class Setup extends PreRecheck, SymTransformer, SetupAPI:

case tree @ SeqLiteral(elems, tpt: TypeTree) =>
traverse(elems)
transformTT(tpt, boxed = true, exact = false)
tpt.rememberType(box(transformInferredType(tpt.tpe)))

case _ =>
traverseChildren(tree)
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7 changes: 7 additions & 0 deletions tests/neg/i19470.check
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@@ -0,0 +1,7 @@
-- [E007] Type Mismatch Error: tests/neg/i19470.scala:9:12 -------------------------------------------------------------
9 | List(foo(f())) // error
| ^^^^^^^^
| Found: Inv[? >: IO <: box IO^{f}]
| Required: box Inv[box IO^?]^?
|
| longer explanation available when compiling with `-explain`
9 changes: 9 additions & 0 deletions tests/neg/i19470.scala
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@@ -0,0 +1,9 @@
import language.experimental.captureChecking
trait IO
case class Inv[X](x: X)

def foo(x: IO^): Inv[IO^{x}] = Inv(x)

def main(io: IO^): Unit =
def test(f: () => IO^) =
List(foo(f())) // error