Reproduce crash in scala#7990

Author: liufengyun

compiler/test/dotty/tools/dotc/CompilationTests.scala

@@ -62,6 +62,8 @@ class CompilationTests extends ParallelTesting {
       compileFile("tests/pos-special/notNull.scala", defaultOptions.and("-Yexplicit-nulls")),
       compileDir("tests/pos-special/adhoc-extension", defaultOptions.and("-strict", "-feature", "-Xfatal-warnings")),
       compileFile("tests/pos-special/i7575.scala", defaultOptions.and("-language:dynamics")),
+
+      withLibs("junit:junit:4.13") { flags => compileFile("tests/pos-custom-args/i7990.scala", flags) }
     ).checkCompile()
   }
 

compiler/test/dotty/tools/vulpix/TestConfiguration.scala

@@ -70,4 +70,25 @@ object TestConfiguration {
 
   /** Enables explicit nulls */
   val explicitNullsOptions = defaultOptions and "-Yexplicit-nulls"
+
+  def withLibs[T](depsRaw: String*)(fn: TestFlags => T): T = {
+    import coursier._
+    import coursier.parse._
+
+    val deps = depsRaw.map { dep =>
+      DependencyParser.dependency(dep, "2.13") match {
+        case Right(dep) => dep
+        case Left(msg) => throw new Exception(msg)
+      }
+    }
+    val jars = Fetch()
+      .addDependencies(deps:_*)
+      .run()
+      .map(_.toString)
+      .toList
+
+    val path = mkClasspath(jars)
+    val flags = defaultOptions.withClasspath(path).withRunClasspath(path)
+    fn(flags)
+  }
 }

project/Build.scala

@@ -238,6 +238,8 @@ object Build {
     scalaModuleInfo ~= (_.map(_.withOverrideScalaVersion(false))),
 
     libraryDependencies += "com.novocode" % "junit-interface" % "0.11" % Test,
+    libraryDependencies += "io.get-coursier" % "coursier_2.13" % "2.0.0-RC5-6" % Test,
+    // libraryDependencies += "io.get-coursier" % "coursier-cache_2.13" % "2.0.0-RC5-6" % Test,
 
     // If someone puts a source file at the root (e.g., for manual testing),
     // don't pick it up as part of any project.

tests/pos-custom-args/i7990.scala

@@ -0,0 +1 @@
+@main def main = org.junit.AssumptionViolatedException("error")