check-fast fallout from removing export, r=burningtree
rustdoc: Remove definitions of spawn_listener and spawn_conversation
rustdoc: Fix some search-and-replace fallout
rustdoc: Remove another use of oldcomm
rustdoc: Remove stray mode
rustdoc: Convert to pipes
core: Remove oldcomm
rt: Remove ports
rt: Remove circular_buffer
rt: Remove get_frame_glue_fns. Unused
rt: Remove some unused upcalls
rt: Add rust_try_get_current_task
Make foreign calls work outside of tasks. #4451
Rewrite the exchange allocator to work without an active scheduler. #4457