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Updated index.md to add a command which can show unoptimized MIR 

The current playground link used in the page of MIR shows a optimized version of MIR which is missing some statements such as StorageLive . Updated to use a local command which shows unoptimized MIR that would be more useful for pedagogical purposes.
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Prashant-Shekhar-Rao 2023-09-07 19:18:37 +05:30 committed by Tshepang Mbambo
parent 3b0eb4cd62
commit a5e35dd106
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@ -62,6 +62,12 @@ show you the MIR for your program. Try putting this program into play
button on the top: button on the top:
[sample-play]: https://play.rust-lang.org/?gist=30074856e62e74e91f06abd19bd72ece&version=stable [sample-play]: https://play.rust-lang.org/?gist=30074856e62e74e91f06abd19bd72ece&version=stable
MIR shown by above link is optimized.
Some statements like `StorageLive` are removed in optimization.
This happens because compiler notices the value is never acessed in the code.
We can use `rustc [filename].rs -Z mir-opt-level=0 --emit mir` to view unoptimized MIR.
This requires the nightly toolchain.
```rust ```rust
fn main() { fn main() {