Remove dependency on itertools

Author: fornwall

backtrace/Cargo.toml

@@ -14,7 +14,6 @@ categories = ["asynchronous", "development-tools::debugging"]
 async-backtrace-attributes = { version = "0.2", path = "../attributes" }
 dashmap = "5.4.0"
 futures = "0.3.21"
-itertools = "0.10.5"
 once_cell = "1.0.0"
 pin-project-lite = "0.2"
 rustc-hash = "1.1.0"

backtrace/src/lib.rs

@@ -168,10 +168,10 @@ macro_rules! frame {
 /// If `wait_for_running_tasks` is `true`, this routine may deadlock if any
 /// non-async lock is held which may also be held by a Framed task.
 pub fn taskdump_tree(wait_for_running_tasks: bool) -> String {
-    itertools::join(
-        tasks().map(|task| task.pretty_tree(wait_for_running_tasks)),
-        "\n",
-    )
+    tasks()
+        .map(|task| task.pretty_tree(wait_for_running_tasks))
+        .collect::<Vec<String>>()
+        .join("\n")
 }
 
 /// Produces a backtrace starting at the currently-active frame (if any).