Apply suggestions from code review

Co-authored-by: Oli Scherer <[email protected]>

Author: TimTheBig

library/proc_macro/src/bridge/closure.rs

@@ -17,7 +17,7 @@ pub(super) struct Closure<'a, A, R> {
 struct Env;
 
 impl<'a, A, R, F: FnMut(A) -> R> From<&'a mut F> for Closure<'a, A, R> {
-    /// Create a `Closure` from a function
+    /// Create a `Closure` from an `FnMut` eg.(function, `||` closure)
     fn from(f: &'a mut F) -> Self {
         unsafe extern "C" fn call<A, R, F: FnMut(A) -> R>(env: *mut Env, arg: A) -> R {
             unsafe { (*(env as *mut _ as *mut F))(arg) }

library/proc_macro/src/bridge/rpc.rs

@@ -253,7 +253,7 @@ pub enum PanicMessage {
 }
 
 impl From<Box<dyn Any + Send>> for PanicMessage {
-    /// downcast the payload and wrap it in `StaticStr` or `String`.
+    /// Extract `String` or `&'static str` payloads if available or default to `Unknown`
     fn from(payload: Box<dyn Any + Send + 'static>) -> Self {
         if let Some(s) = payload.downcast_ref::<&'static str>() {
             return PanicMessage::StaticStr(s);
@@ -266,7 +266,7 @@ impl From<Box<dyn Any + Send>> for PanicMessage {
 }
 
 impl From<PanicMessage> for Box<dyn Any + Send> {
-    /// Return the inner wrapped in `Box`.
+    /// Return the inner message wrapped in `Box`.
     ///
     /// ## Cost
     /// Allocates a new `Box` on the heap

library/proc_macro/src/lib.rs

@@ -238,7 +238,7 @@ fn tree_to_bridge_tree(
 /// Creates a token stream containing a single token tree.
 #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
 impl From<TokenTree> for TokenStream {
-    /// Convert the tree to a bridge tree then a `TokenStream`
+    /// Convert the tree to a `TokenStream`
     fn from(tree: TokenTree) -> TokenStream {
         TokenStream(Some(bridge::client::TokenStream::from_token_tree(tree_to_bridge_tree(tree))))
     }