Some better performance by avoiding copies

Cargo.toml

@@ -39,13 +39,14 @@ http = "*"
 shellexpand = "1.0"
 itertools = "0.8"
 comfy-table = "0.0.6"
+lazy_static = "*"
 
 [patch.crates-io]
 openapiv3 = { git = "https://github.com/glademiller/openapiv3", branch = "master" }
 
 
 [profile.dev]
-debug=0
+debug = 0
 
 [profile.release]
 opt-level = 3

src/main.rs

@@ -1,5 +1,5 @@
 //mod string_validator;
-//#![deny(clippy::all)]
+#![deny(clippy::all)]
 #![forbid(unsafe_code)]
 
 mod cli_args;
@@ -26,17 +26,17 @@ fn main() {
     let spec = spec::read(&config.filename).deref_all();
     let service = Service::new(&config, spec.servers[0].base_path());
     let mutator = mutation::Mutator::new(&config.conv_filename);
+    let mut results = Vec::new();
+
 
     // Create endpoints from the spec file.
-    let endpoints = spec.paths.iter().flat_map(|(path_name, methods)| {
+    let endpoints: Vec<operation::Endpoint> = spec.paths.iter().flat_map(|(path_name, methods)| {
         operation::Endpoint::create_supported_endpoint(path_name, methods.to_item_ref())
-    });
+    }).collect();
 
-    let mut results = Vec::new();
+    let scenarios = endpoints.iter().flat_map(|e| mutator.mutate(e));
 
     let start = Instant::now();
-    let scenarios = endpoints.flat_map(|e| mutator.mutate(&e));
-
     for scenario in scenarios {
         //  println!("{:?}", scenario.instructions);
         reporter::print_mutation_scenario(&scenario);