provide[procedure] require feature
[procedure] provide feature
[procedure] provided? feature
Loads a library specified by feature.
SCM: feature is a symbol. Mapping from feature to the pathname of the library
file is managed by global catalog.
STk, STklos, Gauche: feature is a string, and it is directly used as a part of the
pathname of the library file to load.
See also STklos:ModuleSystem?, Gauche:ModuleSystem.
See also require-extension.
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