diff --git a/src/tools/rust-analyzer/xtask/src/codegen/assists_doc_tests.rs b/src/tools/rust-analyzer/xtask/src/codegen/assists_doc_tests.rs
index 1bb7845b9c86..dd55d06bd347 100644
--- a/src/tools/rust-analyzer/xtask/src/codegen/assists_doc_tests.rs
+++ b/src/tools/rust-analyzer/xtask/src/codegen/assists_doc_tests.rs
@@ -53,6 +53,11 @@ r#####"
         );
     }
 
+    // Do not generate assists manual when run with `--check`
+    if check {
+        return;
+    }
+
     {
         // Generate assists manual. Note that we do _not_ commit manual to the
         // git repo. Instead, `cargo xtask release` runs this test before making
diff --git a/src/tools/rust-analyzer/xtask/src/codegen/diagnostics_docs.rs b/src/tools/rust-analyzer/xtask/src/codegen/diagnostics_docs.rs
index 7858e9ae1b4d..4a47a5f6aa4b 100644
--- a/src/tools/rust-analyzer/xtask/src/codegen/diagnostics_docs.rs
+++ b/src/tools/rust-analyzer/xtask/src/codegen/diagnostics_docs.rs
@@ -10,13 +10,15 @@ use crate::{
 
 pub(crate) fn generate(check: bool) {
     let diagnostics = Diagnostic::collect().unwrap();
-    if !check {
-        let contents =
-            diagnostics.into_iter().map(|it| it.to_string()).collect::<Vec<_>>().join("\n\n");
-        let contents = add_preamble(crate::flags::CodegenType::DiagnosticsDocs, contents);
-        let dst = project_root().join("docs/book/src/diagnostics_generated.md");
-        fs::write(dst, contents).unwrap();
+    // Do not generate docs when run with `--check`
+    if check {
+        return;
     }
+    let contents =
+        diagnostics.into_iter().map(|it| it.to_string()).collect::<Vec<_>>().join("\n\n");
+    let contents = add_preamble(crate::flags::CodegenType::DiagnosticsDocs, contents);
+    let dst = project_root().join("docs/book/src/diagnostics_generated.md");
+    fs::write(dst, contents).unwrap();
 }
 
 #[derive(Debug)]
diff --git a/src/tools/rust-analyzer/xtask/src/codegen/feature_docs.rs b/src/tools/rust-analyzer/xtask/src/codegen/feature_docs.rs
index c10ada253376..170de5db9a7a 100644
--- a/src/tools/rust-analyzer/xtask/src/codegen/feature_docs.rs
+++ b/src/tools/rust-analyzer/xtask/src/codegen/feature_docs.rs
@@ -8,8 +8,12 @@ use crate::{
     util::list_rust_files,
 };
 
-pub(crate) fn generate(_check: bool) {
+pub(crate) fn generate(check: bool) {
     let features = Feature::collect().unwrap();
+    // Do not generate docs when run with `--check`
+    if check {
+        return;
+    }
     let contents = features.into_iter().map(|it| it.to_string()).collect::<Vec<_>>().join("\n\n");
     let contents = add_preamble(crate::flags::CodegenType::FeatureDocs, contents);
     let dst = project_root().join("docs/book/src/features_generated.md");