Only check docs on rustc 1.52 as rustc stable now crashes

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d24b2be7a45dc3fd7a0b4f95f741552b6a8424a4..716d4b0b751d5f7c5c1837e3ab5575c913b6b7a2 100644 (file)
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -165,7 +165,9 @@ jobs:
   check_commits:
     runs-on: ubuntu-latest
     env:
-      TOOLCHAIN: stable
+      # rustc 1.53 regressed and panics when building our (perfectly fine) docs.
+      # See https://github.com/rust-lang/rust/issues/84738
+      TOOLCHAIN: 1.52.1
     steps:
       - name: Checkout source code
         uses: actions/checkout@v2