Matt G questions

• (Racket) "Cannot reference an identifier before its definition" with identifier imported from module
• OO best practice regarding returning less/more specific interface when returning an interface
• "Unexpected token" using lower-bounded wildcard (Java)
• Why do I need to use finally to close resources?
• Templates accepting "anything" in C++
• C++ appears to violate properties of addition
• Use generic to store common supertype in Java
• How do I do anything with multiple return values in racket?
• List of useful environment settings in Java

Matt G answers