internal: improve compilation critical path a bit

crates/proc_macro_api/src/lib.rs

@@ -63,7 +63,7 @@ impl ProcMacroProcessExpander {
             macro_body: FlatTree::new(subtree),
             macro_name: self.name.to_string(),
             attributes: attr.map(FlatTree::new),
-            lib: self.dylib_path.to_path_buf(),
+            lib: self.dylib_path.to_path_buf().into(),
             env,
         };
 

crates/proc_macro_api/src/process.rs

@@ -39,7 +39,7 @@ impl ProcMacroProcessSrv {
         &mut self,
         dylib_path: &AbsPath,
     ) -> Result<Vec<(String, ProcMacroKind)>, tt::ExpansionError> {
-        let task = ListMacrosTask { lib: dylib_path.to_path_buf() };
+        let task = ListMacrosTask { lib: dylib_path.to_path_buf().into() };
 
         let result: ListMacrosResult = self.send_task(Request::ListMacro(task))?;
         Ok(result.macros)

crates/proc_macro_api/src/rpc.rs

@@ -7,14 +7,15 @@
 //! for separation of code responsibility.
 pub(crate) mod flat;
 
-use paths::AbsPathBuf;
+use std::path::PathBuf;
+
 use serde::{Deserialize, Serialize};
 
 use crate::rpc::flat::FlatTree;
 
 #[derive(Clone, Eq, PartialEq, Debug, Serialize, Deserialize)]
 pub struct ListMacrosTask {
-    pub lib: AbsPathBuf,
+    pub lib: PathBuf,
 }
 
 #[derive(Copy, Clone, Eq, PartialEq, Debug, Serialize, Deserialize)]
@@ -46,7 +47,7 @@ pub struct ExpansionTask {
     /// Possible attributes for the attribute-like macros.
     pub attributes: Option<FlatTree>,
 
-    pub lib: AbsPathBuf,
+    pub lib: PathBuf,
 
     /// Environment variables to set during macro expansion.
     pub env: Vec<(String, String)>,
@@ -93,7 +94,7 @@ mod tests {
             macro_body: FlatTree::new(&tt),
             macro_name: Default::default(),
             attributes: None,
-            lib: AbsPathBuf::assert(std::env::current_dir().unwrap()),
+            lib: std::env::current_dir().unwrap(),
             env: Default::default(),
         };