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This commit guards the std::error::Error impl and the from_reader function behind a new (default) "std" feature and relevant uses to core and alloc in order to allow this crate to compile without std (tho alloc is required).
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This PR makes this crate
#![no_std]and adds a"std"feature for thestd::error::Errorimpl on theErrorenum and thefrom_readerfunction. The new feature"std"is a default feature to enable all current features by default.