diff --git a/lib/remap-lang/src/error.rs b/lib/remap-lang/src/error.rs
index 35ed82c2b31715..817a0eb60e1001 100644
--- a/lib/remap-lang/src/error.rs
+++ b/lib/remap-lang/src/error.rs
@@ -115,19 +115,19 @@ impl<'a> From<(&'a str, program::Error)> for ProgramError<'a> {
 
 fn fmt_diagnostic(f: &mut fmt::Formatter<'_>, source: &str, diagnostic: Diagnostic) -> fmt::Result {
     use codespan_reporting::files::SimpleFile;
-    use codespan_reporting::term::{self, DisplayStyle};
+    use codespan_reporting::term;
     use std::str::from_utf8;
     use termcolor::Buffer;
 
     let file = SimpleFile::new("<source>", source);
-    let mut config = term::Config::default();
-    config.display_style = if f.alternate() {
-        DisplayStyle::Short
+    let config = term::Config::default();
+
+    let mut buffer = if f.alternate() {
+        Buffer::ansi()
     } else {
-        DisplayStyle::Rich
+        Buffer::no_color()
     };
 
-    let mut buffer = Buffer::no_color();
     term::emit(&mut buffer, &config, &file, &diagnostic.into()).map_err(|_| fmt::Error)?;
 
     f.write_str(from_utf8(buffer.as_slice()).map_err(|_| fmt::Error)?)
diff --git a/lib/remap-tests/src/main.rs b/lib/remap-tests/src/main.rs
index ad6d9b75388eb8..44b48d489a6889 100644
--- a/lib/remap-tests/src/main.rs
+++ b/lib/remap-tests/src/main.rs
@@ -4,6 +4,11 @@ use std::fs;
 use std::path::PathBuf;
 
 fn main() {
+    let verbose = std::env::args()
+        .nth(1)
+        .map(|s| s == "--verbose")
+        .unwrap_or_default();
+
     let mut failed_count = 0;
     let tests = fs::read_dir("tests").expect("dir exists");
 
@@ -31,6 +36,10 @@ fn main() {
 
                         if got == want {
                             println!("{}", Colour::Green.bold().paint("OK"));
+
+                            if verbose {
+                                println!("{:#}", value);
+                            }
                         } else {
                             println!("{} (expectation)", Colour::Red.bold().paint("FAILED"));
 
@@ -45,6 +54,10 @@ fn main() {
                         let got = err.to_string();
                         if got == want {
                             println!("{}", Colour::Green.bold().paint("OK"));
+
+                            if verbose {
+                                println!("{:#}", err);
+                            }
                         } else {
                             println!("{} (runtime)", Colour::Red.bold().paint("FAILED"));
                             println!("{}", err);
@@ -57,6 +70,10 @@ fn main() {
                 let want = want.trim().to_owned();
                 if got == want {
                     println!("{}", Colour::Green.bold().paint("OK"));
+
+                    if verbose {
+                        println!("{:#}", err);
+                    }
                 } else {
                     println!("{} (compilation)", Colour::Red.bold().paint("FAILED"));