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Guile Reference Manual

25.4 Querying variable bindings

Guile provides a procedure for checking whether a symbol is bound in the top level environment.

Scheme Procedure: defined? sym [env]

C Function: scm_definedp (sym, env)

Return #t if sym is defined in the lexical environment env. When env is not specified, look in the top-level environment as defined by the current module.