errors now emit sources

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "oink"
-version = "0.0.1"
+version = "0.0.2"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

rust-toolchain.toml

@@ -0,0 +1,4 @@
+
+[toolchain]
+channel = "nightly"
+

src/main.rs

@@ -1,3 +1,4 @@
+#![feature(error_in_core)]
 use std::process::exit;
 
 use pico_args::Arguments;

src/operation.rs

@@ -5,6 +5,7 @@ use std::{
 	io::Write,
 	path::Path
 };
+use core::error::Error;
 
 use toml::{ map::Map, Value };
 use tera::{ Context, Tera };
@@ -66,7 +67,10 @@ pub fn build(targets: &Vec<Map<String, Value>>, tera: &mut Tera, context: &Conte
 		let render = tera.render(name, context);
 		//	handle rendering errors gracefully
 		if render.is_err() {
-			println!("    failed to render template");
+			let error = render.err().unwrap();
+			let message = error.source().unwrap();
+
+			println!("   failed to render template:\n      {message}");
 			continue;
 		}