$ javac StringTemplate.java
src/broken/StringTemplate.java:4: error: illegal escape character
        System.out.println(STR."Hello, \{name}");
                                        ^
1 error

$ javac --enable-preview --release 25 StringTemplate.java
src/broken/StringTemplate.java:4: error: illegal escape character
        System.out.println(STR."Hello, \{name}");
                                        ^
1 error