Cleanup ensure_if_default to not require Option output

Author: Kobzol

src/bootstrap/src/core/build_steps/dist.rs

@@ -1548,7 +1548,7 @@ impl Step for Extended {
         let mut built_tools = HashSet::new();
         macro_rules! add_component {
             ($name:expr => $step:expr) => {
-                if let Some(tarball) = builder.ensure_if_default($step, Kind::Dist) {
+                if let Some(Some(tarball)) = builder.ensure_if_default($step, Kind::Dist) {
                     tarballs.push(tarball);
                     built_tools.insert($name);
                 }

src/bootstrap/src/core/build_steps/tool.rs

@@ -1130,7 +1130,8 @@ pub struct RustAnalyzerProcMacroSrv {
 }
 
 impl Step for RustAnalyzerProcMacroSrv {
-    type Output = Option<ToolBuildResult>;
+    type Output = ToolBuildResult;
+
     const DEFAULT: bool = true;
     const ONLY_HOSTS: bool = true;
 
@@ -1152,7 +1153,7 @@ impl Step for RustAnalyzerProcMacroSrv {
         });
     }
 
-    fn run(self, builder: &Builder<'_>) -> Option<ToolBuildResult> {
+    fn run(self, builder: &Builder<'_>) -> Self::Output {
         let tool_result = builder.ensure(ToolBuild {
             build_compiler: self.compiler,
             target: self.target,
@@ -1176,7 +1177,7 @@ impl Step for RustAnalyzerProcMacroSrv {
             FileType::Executable,
         );
 
-        Some(tool_result)
+        tool_result
     }
 }
 

src/bootstrap/src/core/builder/mod.rs

@@ -1705,11 +1705,11 @@ You have to build a stage1 compiler for `{}` first, and then use it to build a s
     /// Ensure that a given step is built *only if it's supposed to be built by default*, returning
     /// its output. This will cache the step, so it's safe (and good!) to call this as often as
     /// needed to ensure that all dependencies are build.
-    pub(crate) fn ensure_if_default<T, S: Step<Output = Option<T>>>(
+    pub(crate) fn ensure_if_default<T, S: Step<Output = T>>(
         &'a self,
         step: S,
         kind: Kind,
-    ) -> S::Output {
+    ) -> Option<S::Output> {
         let desc = StepDescription::from::<S>(kind);
         let should_run = (desc.should_run)(ShouldRun::new(self, desc.kind));
 
@@ -1721,7 +1721,7 @@ You have to build a stage1 compiler for `{}` first, and then use it to build a s
         }
 
         // Only execute if it's supposed to run as default
-        if desc.default && should_run.is_really_default() { self.ensure(step) } else { None }
+        if desc.default && should_run.is_really_default() { Some(self.ensure(step)) } else { None }
     }
 
     /// Checks if any of the "should_run" paths is in the `Builder` paths.