Some additions and changes in tests (#17327)

Author: odersky

tests/neg-custom-args/captures/filevar.scala

@@ -0,0 +1,18 @@
+import language.experimental.captureChecking
+import compiletime.uninitialized
+
+class File:
+  def write(x: String): Unit = ???
+
+class Service:
+  var file: {*} File = uninitialized
+  def log = file.write("log")  // error
+
+def withFile[T](op: (f: {*} File) => T): T =
+  op(new File)
+
+def test =
+  withFile: f =>
+    val o = Service()
+    o.file = f
+    o.log

tests/pending/pos/i16826.scala

@@ -0,0 +1,10 @@
+import language.experimental.captureChecking
+class A
+class B(a: {*} A)
+class C(a: {*} A):
+  def setB(b: {a} B): Unit = ???
+
+
+def test(a1: {*} A)(b1: {a1} B) =
+  val c = new C(a1)
+  c.setB(b1)

tests/pos-custom-args/captures/filevar.scala

@@ -0,0 +1,37 @@
+import language.experimental.captureChecking
+import annotation.capability
+import compiletime.uninitialized
+
+object test1:
+  class File:
+    def write(x: String): Unit = ???
+
+  class Service(f: {*} File):
+    def log = f.write("log")
+
+  def withFile[T](op: (f: {*} File) => T): T =
+    op(new File)
+
+  def test =
+    withFile: f =>
+      val o = Service(f)
+      o.log
+
+object test2:
+  @capability class IO
+
+  class File:
+    def write(x: String): Unit = ???
+
+  class Service(io: IO):
+    var file: {io} File = uninitialized
+    def log = file.write("log")
+
+  def withFile[T](io: IO)(op: (f: {io} File) => T): T =
+    op(new File)
+
+  def test(io: IO) =
+    withFile(io): f =>
+      val o = Service(io)
+      o.file = f
+      o.log

tests/pos-custom-args/captures/nested-classes.scala

@@ -0,0 +1,21 @@
+import language.experimental.captureChecking
+import annotation.{capability, constructorOnly}
+
+@capability class IO
+class Blah
+class Pkg(using @constructorOnly io: IO):
+  class Foo:
+    def m(foo: {io} Blah) = ???
+class Pkg2(using io: IO):
+  class Foo:
+    def m(foo: {io} Blah): Any = io; ???
+
+def main(using io: IO) =
+  val pkg = Pkg()
+  val f = pkg.Foo()
+  f.m(???)
+  val pkg2 = Pkg2()
+  val f2 = pkg2.Foo()
+  f2.m(???)
+
+

tests/run/errorhandling/Result.scala

@@ -29,14 +29,14 @@ object Result:
       case err: Err[_] => err
 
     /** Validate both `r` and `other`; return a pair of successes or a list of failures. */
-    def * [U](other: Result[U, E]): Result[(T, U), List[E]] = (r, other) match
+    def zip[U](other: Result[U, E]): Result[(T, U), List[E]] = (r, other) match
       case (Ok(x), Ok(y))     => Ok((x, y))
       case (Ok(_), Err(e))    => Err(e :: Nil)
       case (Err(e), Ok(_))    => Err(e :: Nil)
       case (Err(e1), Err(e2)) => Err(e1 :: e2 :: Nil)
 
     /** Validate both `r` and `other`; return a tuple of successes or a list of failures.
-     *  Unlike with `*`, the right hand side `other` must be a `Result` returning a `Tuple`,
+     *  Unlike with `zip`, the right hand side `other` must be a `Result` returning a `Tuple`,
      *  and the left hand side is added to it. See `Result.empty` for a convenient
      *  right unit of chains of `*:`s.
      */