remove unneeded macro

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "merlin"
-version = "1.4.1"
+version = "1.4.2"
 authors = ["geremachek <mrender2005@gmail.com>"]
 edition = "2018"
 

src/plane/input.rs

@@ -2,14 +2,6 @@ use crate::util;
 use super::{Plane, Vision};
 use std::io::{self, Write, BufRead};
 
-// flush stdout, handling errors
-
-macro_rules! flush_stdout {
-	() => {
-		util::err_msg(io::stdout().flush(), "unable to flush stdout")
-	}
-}
-
 impl Plane {
 	pub fn repl(&mut self) {
 		let mut input = String::new();
@@ -22,7 +14,7 @@ impl Plane {
 				Vision::Scribe => self.parse_line(";scribe-prompt"),
 			};
 
-			flush_stdout!();                                                         // flush stdout, handling any errors
+			flush_stdout();                                                          // flush stdout, handling any errors
 			util::err_msg(io::stdin().read_line(&mut input), "unable to read line"); // read a line of input (handle any errors)
 
 			// parse our line, stripping newlines
@@ -38,7 +30,7 @@ impl Plane {
 			self.parse_line(strip_nl(&line
 				.expect(&format!("{} {}", util::ERROR_PREFIX, "can't read stdin"))));
 
-			flush_stdout!();
+			flush_stdout();
 
 			if !self.running {
 				break;
@@ -54,3 +46,9 @@ fn strip_nl(input: &str) -> &str {
 		.or_else(|| input.strip_suffix("\n"))
 		.unwrap_or(&input)
 }
+
+// flush stdout, handling errors
+
+fn flush_stdout() {
+	util::err_msg(io::stdout().flush(), "unable to flush stdout")
+}

src/util.rs

@@ -3,7 +3,7 @@
 pub const ERROR_PREFIX: &str = "merlin:";
 
 pub fn err_msg<T, E>(res: Result<T, E>, msg: &str) {
-	if let Err(_) = res {
+	if res.is_err() {
 		eprintln!("{} {}", ERROR_PREFIX, msg);
 	}
 }