To avoid monomorphizing psm::on_stack::with_on_stack 1500 times, I made a change in stacker to wrap the callback in dyn.

Author: Julian Wollersberger

Cargo.lock

@@ -4436,9 +4436,9 @@ checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
 
 [[package]]
 name = "stacker"
-version = "0.1.11"
+version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a92bc346006ae78c539d6ab2cf1a1532bc657b8339c464877a990ec82073c66f"
+checksum = "21ccb4c06ec57bc82d0f610f1a2963d7648700e43a6f513e564b9c89f7991786"
 dependencies = [
  "cc",
  "cfg-if",

compiler/rustc_data_structures/Cargo.toml

@@ -26,7 +26,7 @@ rustc_index = { path = "../rustc_index", package = "rustc_index" }
 bitflags = "1.2.1"
 measureme = "0.7.1"
 libc = "0.2"
-stacker = "0.1.11"
+stacker = "0.1.12"
 tempfile = "3.0.5"
 
 [dependencies.parking_lot]