There's a common LDAP attribute called userCertificate;binary. It actually has a semi-colon in the attribute name. In ruby, I turn an LDAP entry into a OpenStruct object called 'struct'.

>> struct.class
=> OpenStruct

But of course ruby thinks it's an end-of-line character.

?> struct.userCertificate;binary
NameError: undefined local variable or method `binary' for main:Object
        from (irb):52
        from :0

IRB knows that the local variable is there, because it gives me struct.userCertificate;binary from the tab auto-completion. I can also see the class variable when calling struct.methods on it.

>> struct.methods
=> ... "send", "methods", "userCertificate;binary=", "hash", ...

It's definitely there, I can see the contents if I print the whole variable to_s(). But how can I access the local variable when it has a semicolon in it? I have workarounds for this but I thought it was an interesting problem to post.