added rayon dependency

Cargo.lock

@@ -468,6 +468,7 @@ dependencies = [
  "num-bigint 0.3.2",
  "num-traits",
  "parking_lot",
+ "rayon",
  "rustpython-parser",
  "test-case",
 ]
@@ -538,6 +539,16 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "num_cpus"
+version = "1.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05499f3756671c15885fee9034446956fff3f243d6077b91e5767df161f766b3"
+dependencies = [
+ "hermit-abi",
+ "libc",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.8.0"
@@ -773,6 +784,31 @@ dependencies = [
  "rand_core",
 ]
 
+[[package]]
+name = "rayon"
+version = "1.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c06aca804d41dbc8ba42dfd964f0d01334eceb64314b9ecf7c5fad5188a06d90"
+dependencies = [
+ "autocfg",
+ "crossbeam-deque",
+ "either",
+ "rayon-core",
+]
+
+[[package]]
+name = "rayon-core"
+version = "1.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d78120e2c850279833f1dd3582f730c4ab53ed95aeaaaa862a2a5c71b1656d8e"
+dependencies = [
+ "crossbeam-channel",
+ "crossbeam-deque",
+ "crossbeam-utils",
+ "lazy_static",
+ "num_cpus",
+]
+
 [[package]]
 name = "redox_syscall"
 version = "0.2.9"

nac3core/Cargo.toml

@@ -12,6 +12,7 @@ rustpython-parser = { git = "https://github.com/RustPython/RustPython", branch =
 itertools = "0.10.1"
 crossbeam = "0.8.1"
 parking_lot = "0.11.1"
+rayon = "1.5.1"
 
 [dev-dependencies]
 test-case = "1.2.0"