(guile.info.gz) Binding Reflection

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 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.
 

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