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I’m becoming a big fan of racer, so I’m all for this! I haven’t looked at the internals however - I presume racer only needs the source for std (and core) not the compiler itself?
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Yes, I think you are correct: only libstd sources are needed,
which are about 3 MiB.
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Two additional notes:
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<li style="margin: 0.5em 0"><p style="margin: 0.5em 0 !important">
the <i>root</i> location of the source SHOULD be
<tt style="font-family: Consolas, Inconsolata, monospace">$prefix/lib/rustlib/src</tt> (this has been standardized
by the Rust community, see <a href="https://github.com/rust-lang/rust-buildbot/pull/102#issuecomment-222771857">rust-buildbot#102</a>).
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In other words, the following file should exist after
installing the package:
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/usr/lib/rustlib/src/rust/src/libstd/io/mod.rs
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<p style="margin: 0.5em 0 !important">
Racer has already been updated to search the source there,
in the absence of RUST_SRC_PATH (see <a href="https://github.com/phildawes/racer/pull/598">racer#598</a>).
</p></li>
<li style="margin: 0.5em 0">If only libstd is included, perhaps the package should be
named libstd-rust-src (for symmetry with libstd-rust-dev),
instead of rust-src.</li>
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Thanks for considering,
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<p style="margin: 0 0 1.2em 0 !important">
d.
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