rvm: Update rust edition to 2021:

    Update edition and including changes made by `cargo fix --edition`.

rvm/Cargo.toml

@@ -2,7 +2,7 @@
 name = "rvm"
 version = "0.1.0"
 authors = ["Jaime <[email protected]>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

rvm/src/compiler/compiler.rs

@@ -578,10 +578,10 @@ impl Compiler {
         // Runtime check on debug builds to ensure function parameter count is actually stored
         #[cfg(debug_assertions)]
         if functions_parameter_count.is_none() {
-            panic!(format!(
+            panic!(
                 "Compiler Debug Error: '{}' function parameter count not stored",
                 function_name
-            ));
+            );
         }
 
         // Ensure that the number of arguments match the number of parameters defined

rvm/src/scanner/scanner.rs

@@ -16,7 +16,7 @@ impl Scanner {
         loop {
             let token = match scanner.scan_token() {
                 Ok(token) => token,
-                Err(err) => panic!(format!("{:?}", err)),
+                Err(err) => panic!("{:?}", err),
             };
 
             if token.line != line as usize {

rvm/src/vm/binary_op_macros.rs

@@ -16,7 +16,7 @@ macro_rules! generic_binary_op {
         // Only run this check during debug builds, assuming correctly generated OpCodes will not have this issue
         #[cfg(debug_assertions)]
         if a.is_none() || b.is_none(){
-            panic!(format!("VM Debug Error: Stack missing values for {} operation '{}'",  $op_name, stringify!($operator)));
+            panic!("VM Debug Error: Stack missing values for {} operation '{}'",  $op_name, stringify!($operator));
         }
 
         match (a, b) {