scala>:jar path/does/not/exist
Cannot add "path/does/not/exist" to classpath.

scala>:jar ../sbt-test/source-dependencies/canon/actual/a.jar
Added '../sbt-test/source-dependencies/canon/actual/a.jar' to classpath.

scala>:jar ../sbt-test/source-dependencies/canon/actual/a.jar
The path '../sbt-test/source-dependencies/canon/actual/a.jar' cannot be loaded, it contains a classfile that already exists on the classpath: ../sbt-test/source-dependencies/canon/actual/a.jar(A.class)

scala>:require ../sbt-test/source-dependencies/canon/actual/a.jar
:require is no longer supported, but has been replaced with :jar. Please use :jar