When applied on varargs parameter, indicates that at least some number of parameters is required.
Used in code generated by macros which traverse sealed hierarchies using knownDirectSubclasses
.
Used in code generated by macros which traverse sealed hierarchies using knownDirectSubclasses
.
Allows the static analyzer to determine if knownDirectSubclasses
used in macro returned correct
result (see SI-7046).
When applied on generic method, requires that all the type parameters are given explicitly (cannot be inferred by the compiler).
When applied on generic method, requires that all the type parameters are given explicitly
(cannot be inferred by the compiler). This is meant primarily for methods whose generics cannot be
inferred from method arguments. Requiring that the programmer specifies them explicitly is a protection
against the compiler inferring Nothing
or Null
.
@explicitGenerics def readJson[T: GenCodec](json: String): T = ... // raise error, because otherwise we have a hidden bug - the compiler infers `Nothing` in place of `T` val x: MyType = readJson("{}") // ok val x = readJson[MyType]("{}")
Symbols annotated with this annotation can only be used in macro-generated code.
When applied on varargs parameter, indicates that at least some number of parameters is required. This is later checked by the static analyzer.
WARNING: implementation of method which takes a varargs parameter may NOT assume that given number of arguments will always be passed, because it's still possible to pass a
Seq
where varargs parameter is required using the: _*
ascription, e.g.varargsMethod(List(): _*)
and that is not checked by the static analyzer.