Invalid documentation of borrowed references

[lamvak]

r4cppp/borrowed.md

Line 76 in 3cea93b

//let xr2 = &x; // Error - there is already a mutable ref, so we

Ignoring irrelevant grokking, the documentation claims only one mutable borrowed ptr can be taken and that a non mutable ptr cannot be borrowed if already a mutable borrowed ptr exists - both seem incorrect. See the output I'm getting (please ignore the irrelevant grokking) when running below:

https://github.com/lamvak/grokking-rust/blob/e01839a2d589f6a57c4058bbd37be8f908b0280b/first_rust_vs/src/main.rs#L23

C:\Users\lamva\Documents\GitHub\grokking-rust\first_rust_vs>cargo run
Finished dev profile [unoptimized + debuginfo] target(s) in 0.15s
Running target\debug\first_rust_vs.exe
Fib(1) = 1
Fib(5) = 8
Fib(10) = 89
from foo: 5
from foo: 5
from foo2: 5
from foo: 5
and the new val: 15