diff options
Diffstat (limited to 'test')
6 files changed, 57 insertions, 0 deletions
diff --git a/test/files/neg/macro-divergence-controlled.check b/test/files/neg/macro-divergence-controlled.check new file mode 100644 index 0000000000..4876f7cf96 --- /dev/null +++ b/test/files/neg/macro-divergence-controlled.check @@ -0,0 +1,4 @@ +Test_2.scala:2: error: could not find implicit value for parameter e: Complex[Foo] + println(implicitly[Complex[Foo]]) + ^ +one error found diff --git a/test/files/neg/macro-divergence-controlled/Impls_Macros_1.scala b/test/files/neg/macro-divergence-controlled/Impls_Macros_1.scala new file mode 100644 index 0000000000..cdea3104a1 --- /dev/null +++ b/test/files/neg/macro-divergence-controlled/Impls_Macros_1.scala @@ -0,0 +1,23 @@ +import scala.reflect.macros.Context +import language.experimental.macros + +trait Complex[T] + +class Foo(val foo: Foo) + +object Complex { + def impl[T: c.WeakTypeTag](c: Context): c.Expr[Complex[T]] = { + import c.universe._ + val tpe = weakTypeOf[T] + for (f <- tpe.declarations.collect{case f: TermSymbol if f.isParamAccessor && !f.isMethod => f}) { + val trecur = appliedType(typeOf[Complex[_]], List(f.typeSignature)) + if (c.openImplicits.tail.exists(ic => ic._1 =:= trecur)) c.abort(c.enclosingPosition, "diverging implicit expansion. reported by a macro!") + val recur = c.inferImplicitValue(trecur, silent = true) + if (recur == EmptyTree) c.abort(c.enclosingPosition, s"couldn't synthesize $trecur") + } + c.literalNull + } + + implicit object ComplexString extends Complex[String] + implicit def genComplex[T]: Complex[T] = macro impl[T] +} diff --git a/test/files/neg/macro-divergence-controlled/Test_2.scala b/test/files/neg/macro-divergence-controlled/Test_2.scala new file mode 100644 index 0000000000..dcc4593335 --- /dev/null +++ b/test/files/neg/macro-divergence-controlled/Test_2.scala @@ -0,0 +1,3 @@ +object Test extends App { + println(implicitly[Complex[Foo]]) +}
\ No newline at end of file diff --git a/test/files/run/macro-divergence-spurious.check b/test/files/run/macro-divergence-spurious.check new file mode 100644 index 0000000000..19765bd501 --- /dev/null +++ b/test/files/run/macro-divergence-spurious.check @@ -0,0 +1 @@ +null diff --git a/test/files/run/macro-divergence-spurious/Impls_Macros_1.scala b/test/files/run/macro-divergence-spurious/Impls_Macros_1.scala new file mode 100644 index 0000000000..bc4a9fded7 --- /dev/null +++ b/test/files/run/macro-divergence-spurious/Impls_Macros_1.scala @@ -0,0 +1,23 @@ +import scala.reflect.macros.Context +import language.experimental.macros + +trait Complex[T] + +class Foo(val bar: Bar) +class Bar(val s: String) + +object Complex { + def impl[T: c.WeakTypeTag](c: Context): c.Expr[Complex[T]] = { + import c.universe._ + val tpe = weakTypeOf[T] + for (f <- tpe.declarations.collect{case f: TermSymbol if f.isParamAccessor && !f.isMethod => f}) { + val trecur = appliedType(typeOf[Complex[_]], List(f.typeSignature)) + val recur = c.inferImplicitValue(trecur, silent = true) + if (recur == EmptyTree) c.abort(c.enclosingPosition, s"couldn't synthesize $trecur") + } + c.literalNull + } + + implicit object ComplexString extends Complex[String] + implicit def genComplex[T]: Complex[T] = macro impl[T] +} diff --git a/test/files/run/macro-divergence-spurious/Test_2.scala b/test/files/run/macro-divergence-spurious/Test_2.scala new file mode 100644 index 0000000000..dcc4593335 --- /dev/null +++ b/test/files/run/macro-divergence-spurious/Test_2.scala @@ -0,0 +1,3 @@ +object Test extends App { + println(implicitly[Complex[Foo]]) +}
\ No newline at end of file |