can any one help me with programming ESP8266 completely in rust lang
This is not possible at the moment, since LLVM has no (official) support for the Xtensa architecture.
If you still want to try it (and I think this is a bad idea), take a look here:
it uses the "inoffical" LLVM backend created by Espressif, but I think its no longer maintained since the last commit was >1 year ago.
There's a docker image for developing rust for the ESP8266 and ESP32, like the other links it's not been updated for a while, but maybe it's useful: https://github.com/ctron/rust-esp-container/
Also there is a matrix channel for the ESP (I think more fore the ESP32, but probably also the ESP8266):
And two Rust repos for the ESP:
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