Meanings
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noun
A standard module or library of subroutines and functions to be imported, generally by default, into a program.
In the same way that Rust has a general prelude that brings certain types and functions into scope automatically, the std::io module has its own prelude of common types and functions you'll need when working with I/O.
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Thesaurus
From Middle French prélude (“singing to test a musical instrument”), from Medieval Latin preludium, from Latin praelūdere.