`x test src/tools/rust-analyzer` fails when download-rustc is enabled

[jyn514]

I tried this code: ./configure --set download-rustc && x test src/tools/rust-analyzer

I expected to see this happen: All tests pass.

Instead, this happened:

Building tool rust-analyzer (stage2)
   Compiling hir-ty v0.0.0 (/home/jyn/src/rust/src/tools/rust-analyzer/crates/hir-ty)
   Compiling proc-macro-srv-cli v0.0.0 (/home/jyn/src/rust/src/tools/rust-analyzer/crates/proc-macro-srv-cli)
   Compiling proc-macro-test v0.0.0 (/home/jyn/src/rust/src/tools/rust-analyzer/crates/proc-macro-test)
error: failed to run custom build command for `proc-macro-test v0.0.0 (/home/jyn/src/rust/src/tools/rust-analyzer/crates/proc-macro-test)`

Caused by:
  process didn't exit successfully: `/home/jyn/src/rust/build/x86_64-unknown-linux-gnu/stage2-tools/release/build/proc-macro-test-3638122eb9dbe3d7/build-script-build` (exit status: 101)
  --- stdout
  cargo:rerun-if-changed=imp
  cargo:rerun-if-env-changed=PROC_MACRO_TEST_TOOLCHAIN
  Creating /home/jyn/src/rust/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/release/build/proc-macro-test-df2f7c1372f2c495/out/proc-macro-test-imp-staging
  Creating /home/jyn/src/rust/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/release/build/proc-macro-test-df2f7c1372f2c495/out/proc-macro-test-imp-staging/src
  Copying /home/jyn/src/rust/src/tools/rust-analyzer/crates/proc-macro-test/imp/Cargo.toml to /home/jyn/src/rust/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/release/build/proc-macro-test-df2f7c1372f2c495/out/proc-macro-test-imp-staging/Cargo.toml
  Copying /home/jyn/src/rust/src/tools/rust-analyzer/crates/proc-macro-test/imp/src/lib.rs to /home/jyn/src/rust/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/release/build/proc-macro-test-df2f7c1372f2c495/out/proc-macro-test-imp-staging/src/lib.rs
  Running cd "/home/jyn/src/rust/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/release/build/proc-macro-test-df2f7c1372f2c495/out/proc-macro-test-imp-staging" && "/home/jyn/src/rust3/build/x86_64-unknown-linux-gnu/stage2-tools-bin/cargo" "build" "-p" "proc-macro-test-impl" "--message-format" "json" "--target-dir" "/home/jyn/src/rust/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/release/build/proc-macro-test-df2f7c1372f2c495/out/target"

  --- stderr
  thread 'main' panicked at 'no dylib for proc-macro-test-impl found', crates/proc-macro-test/build.rs:99:39

Meta

HEAD is branched from ce1073b.

[jyn514]

This ... appears to be working now? I can't reproduce it locally.

[jyn514]

Going to close this, it's also passing on latest master without changes.