diff --git a/app/gui/language/span-tree/src/main.rs b/app/gui/language/span-tree/src/main.rs
new file mode 100644
index 000000000000..cbd4577a442f
--- /dev/null
+++ b/app/gui/language/span-tree/src/main.rs
@@ -0,0 +1,39 @@
+//! Command-line debug tool for `SpanTree`. Accepts a single line of Enso source code as an
+//! argument, and prints a debug representation of the resulting `SpanTree`.
+
+// === Standard Linter Configuration ===
+#![deny(non_ascii_idents)]
+#![warn(unsafe_code)]
+#![allow(clippy::bool_to_int_with_if)]
+#![allow(clippy::let_and_return)]
+// === Non-Standard Linter Configuration ===
+#![warn(missing_docs)]
+#![warn(trivial_casts)]
+#![warn(trivial_numeric_casts)]
+#![warn(unused_import_braces)]
+#![warn(unused_qualifications)]
+#![warn(missing_copy_implementations)]
+#![warn(missing_debug_implementations)]
+
+use span_tree::generate;
+use span_tree::generate::SpanTreeGenerator;
+use span_tree::SpanTree;
+
+
+
+// ===================
+// === Entry point ===
+// ===================
+
+#[allow(missing_docs)]
+pub fn main() {
+    let mut args = std::env::args();
+    let _ = args.next().unwrap();
+    let code = args.next().unwrap();
+
+    let parser = parser::Parser::new();
+    let ast = parser.parse_line_ast(&code).unwrap();
+    let tree: SpanTree = ast.generate_tree(&generate::context::Empty).unwrap();
+    let tree = tree.debug_print(&code);
+    println!("{tree}");
+}