Consider the following modules:
./test/module-info.java
module test {
    requires transitive transitive;
}

./transitive/module-info.java
module transitive {}

And compile like:
$ javac -d out/ --module-source-path . transitive/module-info.java test/module-info.java
test/module-info.java:2: error: repeated modifier
    requires transitive transitive;
                        ^
test/module-info.java:2: error: <identifier> expected
    requires transitive transitive;
                                  ^
2 errors

This is incorrect: module can be named `transitive`.