Replace lazy_static! with once_cell::sync::Lazy

dynamic_instrumentation/Cargo.toml

@@ -9,7 +9,7 @@ bincode = "1.0.1"
 c2rust-analysis-rt = { path = "../analysis/runtime"}
 indexmap = "1.8"
 itertools = "0.10"
-lazy_static = "1.4"
+once_cell = "1.13"
 log = "0.4"
 fs-err = "2"
 clap = { version = "3.2", features = ["derive"] }

dynamic_instrumentation/src/callbacks.rs

@@ -1,3 +1,4 @@
+use once_cell::sync::Lazy;
 use rustc_ast::ast::{Item, ItemKind, Visibility, VisibilityKind};
 use rustc_ast::node_id::NodeId;
 use rustc_ast::ptr::P;
@@ -13,14 +14,9 @@ use rustc_span::def_id::LocalDefId;
 use rustc_span::symbol::Ident;
 use rustc_span::DUMMY_SP;
 
-use lazy_static::lazy_static;
-
 use crate::instrument::Instrumenter;
 
-lazy_static! {
-    /// TODO(kkysen) can be made non-lazy when `Mutex::new` is `const` in rust 1.63
-    pub static ref INSTRUMENTER: Instrumenter = Instrumenter::new();
-}
+pub static INSTRUMENTER: Lazy<Instrumenter> = Lazy::new(Instrumenter::new);
 
 pub struct MirTransformCallbacks;
 

dynamic_instrumentation/src/instrument.rs

@@ -40,8 +40,6 @@ impl Instrumenter {
     /// A single [`Instrumenter`] instance should be shared across the
     /// entire crate being instrumented, as the indexed source locations are
     /// shared and should be global.
-    ///
-    /// TODO(kkysen) can be made `const` when `Mutex::new` is `const` in rust 1.63
     pub fn new() -> Self {
         Self::default()
     }