use std::time::Instant;

// When this struct is dropped, it logs a message stating its name and how long, in seconds,
// execution time was. Can be used to time functions or other critical areas.
pub struct ExecutionTimer<'a> {
	start_time: Instant,
	name: &'a str
}

impl<'a> ExecutionTimer<'a> {
	pub fn new(name: &'a str) -> ExecutionTimer<'a> {
		ExecutionTimer {
			start_time: Instant::now(),
			name: name
		}
	}

	// Construct a new ExecutionTimer and prints a message saying execution is starting.
	pub fn with_start_message(name: &'a str) -> ExecutionTimer<'a> {
		debug!("Execution Starting, Name={}", name);
		ExecutionTimer {
			start_time: Instant::now(),
			name: name
		}
	}
}

impl<'a> Drop for ExecutionTimer<'a> {
	fn drop(&mut self) {
		let elapsed = self.start_time.elapsed();
        let secs = (elapsed.as_secs() as f64) + (elapsed.subsec_nanos() as f64 / 1000_000_000.0);
		debug!("Execution Completed, Seconds={}, Name={}", secs, self.name);
	}
}

use std::time::Instant;

// When this struct is dropped, it logs a message stating its name and how long, in seconds,
// execution time was. Can be used to time functions or other critical areas.
pub struct ExecutionTimer<'a> {
	start_time: Instant,
	name: &'a str
}

impl<'a> ExecutionTimer<'a> {
	pub fn new(name: &'a str) -> ExecutionTimer<'a> {
		ExecutionTimer {
			start_time: Instant::now(),
			name: name
		}
	}

	// Construct a new ExecutionTimer and prints a message saying execution is starting.
	pub fn with_start_message(name: &'a str) -> ExecutionTimer<'a> {
		debug!("Execution Starting, Name={}", name);
		ExecutionTimer::new(name)
	}
}

impl<'a> Drop for ExecutionTimer<'a> {
	fn drop(&mut self) {
		let elapsed = self.start_time.elapsed();
        let secs = (elapsed.as_secs() as f64) + (elapsed.subsec_nanos() as f64 / 1000_000_000.0);
		debug!("Execution Completed, Seconds={}, Name={}", secs, self.name);
	}
}

--- 
+++ 
@@ -18,7 +18,10 @@
 	// Construct a new ExecutionTimer and prints a message saying execution is starting.
 	pub fn with_start_message(name: &'a str) -> ExecutionTimer<'a> {
 		debug!("Execution Starting, Name={}", name);
-		ExecutionTimer::new(name)
+		ExecutionTimer {
+			start_time: Instant::now(),
+			name: name
+		}
 	}
 }
 
Improve ExecutionTimer - avoid a method call.
