Adapt fun prototype when looking for second chance implicits (aka BigInt)

If we look for aprototype of the form

  select(name, FunProto(args, ...))

it's important that the result type of the FunProto type is a wildcard type, because implicit views are disabled for that match.

--- this commit achieves the first bootstrap of dotty! ---

Author: odersky

src/dotty/tools/dotc/typer/Applications.scala

@@ -448,7 +448,9 @@ trait Applications extends Compatibility { self: Typer =>
                 // try with prototype `[].name(args)`, this might succeed by inserting an
                 // implicit conversion around []. (an example is Int + BigInt).
                 tryEither { implicit ctx =>
-                  val qual1 = adaptInterpolated(qual, new SelectionProto(name, proto, NoViewsAllowed))
+                  val simpleFunProto = new FunProto(tree.args, WildcardType, this) // drop result type, because views are disabled
+                  val selProto = new SelectionProto(name, simpleFunProto, NoViewsAllowed)
+                  val qual1 = adaptInterpolated(qual, selProto)
                   if (qual eq qual1) ctx.error("no progress")
                   if (ctx.reporter.hasErrors) qual1
                   else

src/dotty/tools/io/ClassPath.scala

@@ -389,7 +389,7 @@ extends ClassPath {
     }
     new MergedClassPath(newEntries, context)
   }
-  def show() {
+  def show(): Unit = {
     println("ClassPath %s has %d entries and results in:\n".format(name, entries.size))
     asClasspathString split ':' foreach (x => println("  " + x))
   }

test/dotc/tests.scala

@@ -54,7 +54,9 @@ class tests extends CompilerTest {
   @Test def dotc_reporting = compileDir(dotcDir + "tools/dotc/reporting")
   @Test def dotc_typer = compileDir(dotcDir + "tools/dotc/typer")
   @Test def dotc_util = compileDir(dotcDir + "tools/dotc/util")
+  @Test def tools_io = compileDir(dotcDir + "tools/io")
+  @Test def tools = compileDir(dotcDir + "tools")
 
-//  @Test def dotc_compilercommand = compileFile(dotcDir + "tools/dotc/config/", "CompilerCommand")
+  @Test def dotc_compilercommand = compileFile(dotcDir + "tools/dotc/config/", "CompilerCommand")
 
 }