internal: slightly improve compile times

As per style guide, avoid monomorphisations

Author: matklad

crates/ide/src/ssr.rs

@@ -41,7 +41,7 @@ pub(crate) fn ssr_assists(
     for (label, source_change) in assists.into_iter() {
         let assist = Assist {
             id,
-            label: Label::new(label),
+            label: Label::new(label.to_string()),
             group: Some(GroupLabel("Apply SSR".into())),
             target: comment_range,
             source_change,

crates/ide_assists/src/assist_context.rs

@@ -131,12 +131,8 @@ impl Assists {
         target: TextRange,
         f: impl FnOnce(&mut AssistBuilder),
     ) -> Option<()> {
-        if !self.is_allowed(&id) {
-            return None;
-        }
-        let label = Label::new(label.into());
-        let assist = Assist { id, label, group: None, target, source_change: None };
-        self.add_impl(assist, f)
+        let mut f = Some(f);
+        self.add_impl(None, id, label.into(), target, &mut |it| f.take().unwrap()(it))
     }
 
     pub(crate) fn add_group(
@@ -146,26 +142,34 @@ impl Assists {
         label: impl Into<String>,
         target: TextRange,
         f: impl FnOnce(&mut AssistBuilder),
+    ) -> Option<()> {
+        let mut f = Some(f);
+        self.add_impl(Some(group), id, label.into(), target, &mut |it| f.take().unwrap()(it))
+    }
+
+    fn add_impl(
+        &mut self,
+        group: Option<&GroupLabel>,
+        id: AssistId,
+        label: String,
+        target: TextRange,
+        f: &mut dyn FnMut(&mut AssistBuilder),
     ) -> Option<()> {
         if !self.is_allowed(&id) {
             return None;
         }
-        let label = Label::new(label.into());
-        let assist = Assist { id, label, group: Some(group.clone()), target, source_change: None };
-        self.add_impl(assist, f)
-    }
 
-    fn add_impl(&mut self, mut assist: Assist, f: impl FnOnce(&mut AssistBuilder)) -> Option<()> {
-        let source_change = if self.resolve.should_resolve(&assist.id) {
+        let source_change = if self.resolve.should_resolve(&id) {
             let mut builder = AssistBuilder::new(self.file);
             f(&mut builder);
             Some(builder.finish())
         } else {
             None
         };
-        assist.source_change = source_change;
 
-        self.buf.push(assist);
+        let label = Label::new(label.into());
+        let group = group.cloned();
+        self.buf.push(Assist { id, label, group, target, source_change });
         Some(())
     }
 

crates/ide_db/src/label.rs

@@ -29,8 +29,7 @@ impl From<Label> for String {
 }
 
 impl Label {
-    pub fn new(label: impl Into<String>) -> Label {
-        let label = label.into();
+    pub fn new(label: String) -> Label {
         assert!(label.starts_with(char::is_uppercase) && !label.ends_with('.'));
         Label(label)
     }

crates/ide_diagnostics/src/lib.rs

@@ -222,7 +222,7 @@ fn unresolved_fix(id: &'static str, label: &str, target: TextRange) -> Assist {
     assert!(!id.contains(' '));
     Assist {
         id: AssistId(id, AssistKind::QuickFix),
-        label: Label::new(label),
+        label: Label::new(label.to_string()),
         group: None,
         target,
         source_change: None,