diff --git a/src/bootstrap/check.rs b/src/bootstrap/check.rs
index 28e7f1fdca7a1..674f891427b9c 100644
--- a/src/bootstrap/check.rs
+++ b/src/bootstrap/check.rs
@@ -64,7 +64,7 @@ impl Step for Std {
     const DEFAULT: bool = true;
 
     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
-        run.all_krates("test")
+        run.all_krates("test").path("library")
     }
 
     fn make_run(run: RunConfig<'_>) {
@@ -162,7 +162,7 @@ impl Step for Rustc {
     const DEFAULT: bool = true;
 
     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
-        run.all_krates("rustc-main")
+        run.all_krates("rustc-main").path("compiler")
     }
 
     fn make_run(run: RunConfig<'_>) {
diff --git a/src/bootstrap/compile.rs b/src/bootstrap/compile.rs
index 00fc1f0434252..8ba081a1c0cd0 100644
--- a/src/bootstrap/compile.rs
+++ b/src/bootstrap/compile.rs
@@ -43,7 +43,7 @@ impl Step for Std {
         // When downloading stage1, the standard library has already been copied to the sysroot, so
         // there's no need to rebuild it.
         let download_rustc = run.builder.config.download_rustc;
-        run.all_krates("test").default_condition(!download_rustc)
+        run.all_krates("test").path("library").default_condition(!download_rustc)
     }
 
     fn make_run(run: RunConfig<'_>) {
@@ -1047,7 +1047,7 @@ impl Step for Assemble {
     const ONLY_HOSTS: bool = true;
 
     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
-        run.path("compiler/rustc")
+        run.path("compiler/rustc").path("compiler")
     }
 
     fn make_run(run: RunConfig<'_>) {
diff --git a/src/bootstrap/doc.rs b/src/bootstrap/doc.rs
index 5f16716a0fdaf..248ae916e38cb 100644
--- a/src/bootstrap/doc.rs
+++ b/src/bootstrap/doc.rs
@@ -417,7 +417,7 @@ impl Step for Std {
 
     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
         let builder = run.builder;
-        run.all_krates("test").default_condition(builder.config.docs)
+        run.all_krates("test").path("library").default_condition(builder.config.docs)
     }
 
     fn make_run(run: RunConfig<'_>) {
@@ -479,11 +479,14 @@ impl Step for Std {
             .iter()
             .map(components_simplified)
             .filter_map(|path| {
-                if path.get(0) == Some(&"library") {
+                if path.len() >= 2 && path.get(0) == Some(&"library") {
+                    // single crate
                     Some(path[1].to_owned())
                 } else if !path.is_empty() {
+                    // ??
                     Some(path[0].to_owned())
                 } else {
+                    // all library crates
                     None
                 }
             })