Do not add the compiler on the dotty-staging classpath

Author: nicolasstucki

project/Build.scala

@@ -761,7 +761,11 @@ object Build {
 
   lazy val `dotty-staging` = project.in(file("staging")).
     withCommonSettings(Bootstrapped).
-    dependsOn(dottyCompiler(Bootstrapped)).
+    // We want the compiler to be present in the compiler classpath when compiling this project but not
+    // when compiling a project that depends on dotty-staging (see ...), but we always need it to be present
+    // on the JVM classpath at runtime.
+    dependsOn(dottyCompiler(Bootstrapped) % "provided").
+    dependsOn(dottyCompiler(Bootstrapped) % "compile->runtime").
     dependsOn(dottyCompiler(Bootstrapped) % "test->test").
     settings(commonBootstrappedSettings).
     settings(commonDottyJarClasspathSettings).

sbt-dotty/sbt-test/sbt-dotty/quoted-example-project/src/changes/Hello.scala

@@ -0,0 +1,9 @@
+package hello
+
+object Main {
+
+  def main(args: Array[String]): Unit = {
+    dotty.tools.dotc.Main.main(Array.empty)
+  }
+
+}

sbt-dotty/sbt-test/sbt-dotty/quoted-example-project/test

@@ -1,2 +1,4 @@
 > run
 > test
+$ copy-file src/changes/Hello.scala src/main/scala/hello/Hello.scala
+-> compile