Fix `x test src/tools/error_index_generator --stage {0,1}`#95440

Merged

bors merged 2 commits intorust-lang:masterfrom

jyn514:error-index

Apr 8, 2022

Commits on Mar 27, 2022

[error index] Move some logic from build.rs to main.rs
jyn514
committed

Commits on Mar 29, 2022

Fix `x test src/tools/error_index_generator --stage {0,1}`
jyn514
committed