feat(rust): Disallows Debug format derivation and Debug formatting in release code.

Author: stevenj

earthly/rust/stdcfgs/cargo_manifest/project.toml

@@ -36,3 +36,5 @@ unchecked_duration_subtraction = "deny"
 unreachable = "deny"
 missing_docs_in_private_items = "deny"
 arithmetic_side_effects = "deny"
+use_debug = "deny"
+disallowed-macros = "deny"

earthly/rust/stdcfgs/cargo_manifest/workspace.toml

@@ -36,3 +36,5 @@ unchecked_duration_subtraction = "deny"
 unreachable = "deny"
 missing_docs_in_private_items = "deny"
 arithmetic_side_effects = "deny"
+use_debug = "deny"
+disallowed-macros = "deny"

earthly/rust/stdcfgs/clippy.toml

@@ -2,3 +2,6 @@ allow-unwrap-in-tests = true
 allow-expect-in-tests = true
 allow-panic-in-tests = true
 arithmetic-side-effects-allowed = ["num_bigint::BigInt"]
+disallowed-macros = [
+    { path = "std::fmt::Debug", reason = "Debug Formatting not permitted in production release code.\nUse #[cfg_attr(debug_assertions, derive(Debug)] instead." },
+]

examples/rust/Cargo.toml

@@ -45,3 +45,5 @@ unchecked_duration_subtraction = "deny"
 unreachable = "deny"
 missing_docs_in_private_items = "deny"
 arithmetic_side_effects = "deny"
+use_debug = "deny"
+disallowed-macros = "deny"

examples/rust/clippy.toml

@@ -2,3 +2,6 @@ allow-unwrap-in-tests = true
 allow-expect-in-tests = true
 allow-panic-in-tests = true
 arithmetic-side-effects-allowed = ["num_bigint::BigInt"]
+disallowed-macros = [
+    { path = "std::fmt::Debug", reason = "Debug Formatting not permitted in production release code.\nUse #[cfg_attr(debug_assertions, derive(Debug)] instead." },
+]

examples/rust/crates/foo/src/main.rs

@@ -5,7 +5,8 @@ use clap::Parser;
 use foo::fmt_hello;
 
 /// Simple program to greet a person
-#[derive(Parser, Debug)]
+#[cfg_attr(debug_assertions, derive(Debug))]
+#[derive(Parser)]
 #[command(author, version, about, long_about = None)]
 struct Args {
     /// Name of the person to greet
@@ -21,6 +22,9 @@ struct Args {
 fn main() {
     let args = Args::parse();
 
+    #[cfg(debug_assertions)]
+    println!("{args:?}");
+
     for cnt in 0..args.count {
         println!("{}", fmt_hello(&args.name, cnt));
     }