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add section on the no MIR error

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Ralf Jung 2019-04-20 18:36:43 +02:00
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README.md
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@ -105,6 +105,13 @@ You may be running `cargo miri` with a different compiler version than the one
used to build the custom libstd that Miri uses, and Miri failed to detect that.
Try deleting `~/.cache/miri`.
#### "no mir for `std::rt::lang_start_internal`"
This means the sysroot you are using was not compiled with Miri in mind. This
should never happen when you use `cargo miri` because that takes care of setting
up the sysroot. If you are using `miri` (the Miri driver) directly, see
[below][testing-miri] for how to set up the sysroot.
## Development and Debugging
If you want to hack on miri yourself, great! Here are some resources you might