Binding Reflection (Guile Reference Manual)

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6.10.4 Querying variable bindings ¶

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

Scheme Procedure: defined? sym [module] ¶

C Function: scm_defined_p (sym, module) ¶

Return #t if sym is defined in the module module or the current module when module is not specified; otherwise return #f.