Safest way to make a serde_json result globally avaialable [duplicate]

问题

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How do I create a global, mutable singleton? (3 answers)

Is it possible to use global variables in Rust? (5 answers)

Closed 18 days ago.

What is a safe way to make a serde_json result globally available in rust?

For instance I have a pub function in a module that contains

let contents  = fs::read_to_string(json_file_path).expect("file not found");     
let myVar: Foo = match serde_json::from_str(&contents){ ...}
 
println!("WIDTH:{}", myVar.Output.width);

static mut myStaticVar: String  = myVar; // <- Error: attempt to use a non-constant value in a constant
 

How would I make the myVar.Output.width variable available to be read by a public function in another module?

Trying to assign myVar to a static mut fails with Error: attempt to use a non-constant value in a constant

来源：https://stackoverflow.com/questions/65187240/safest-way-to-make-a-serde-json-result-globally-avaialable