((id "and")
 (args "expr ...")
 (description "True iif every expr is true. [SRFI 0]"))

((id "not")
 (args "expr")
 (description "True iif expr is false. [SRFI 0]"))

((id "or")
 (args "expr ...")
 (description "True iif at least one expr is true. [SRFI 0]"))

((id "library")
 (args "name")
 (description "True iif library name is importable. [R7RS]"))

((id "compilation-target")
 (args "target ...")
 (description "True iif at least one target is supported. [Gambit]"))