Enable rustdoc-map nightly feature via .cargo/config.toml

… instead of using -Z on the command line.

.cargo/config.toml

@@ -37,4 +37,5 @@ rustflags = [
 # activate the target-applies-to-host feature.
 # Required for `target-applies-to-host` at the top to take effect.
 [unstable]
+rustdoc-map = true
 target-applies-to-host = true

.github/workflows/docs.yml

@@ -34,7 +34,7 @@ jobs:
           RUSTDOCFLAGS: "--enable-index-page -Zunstable-options --cfg docsrs -Dwarnings"
         with:
           command: doc
-          args: --no-deps --workspace --exclude matrix-sdk-crypto-js --exclude matrix-sdk-crypto-nodejs --features docsrs -Zrustdoc-map
+          args: --no-deps --workspace --exclude matrix-sdk-crypto-js --exclude matrix-sdk-crypto-nodejs --features docsrs
 
       - name: Deploy docs
         if: github.event_name == 'push' && github.ref == 'refs/heads/main'

xtask/src/main.rs

@@ -51,7 +51,7 @@ fn build_docs(
     }
 
     // Keep in sync with .github/workflows/docs.yml
-    cmd!("rustup run nightly cargo doc --no-deps --workspace --features docsrs -Zrustdoc-map")
+    cmd!("rustup run nightly cargo doc --no-deps --workspace --features docsrs")
         // Work around https://github.com/rust-lang/cargo/issues/10744
         .env("CARGO_TARGET_APPLIES_TO_HOST", "true")
         .env("RUSTDOCFLAGS", rustdocflags)