1 files changed, 31 insertions, 0 deletions
diff --git a/src/diagnostics/unterminated_comment.rs b/src/diagnostics/unterminated_comment.rs
new file mode 100644
index 0000000..2c583a4
--- /dev/null
+++ b/src/diagnostics/unterminated_comment.rs
@@ -0,0 +1,31 @@
+use miette::Diagnostic;
+use thiserror::Error;
+
+use crate::{
+	diagnostics::TokenDiagnostic,
+	tokenize::{Span, Token, TokenType},
+};
+
+#[derive(Error, Debug, Diagnostic)]
+#[error("Unterminated comment")]
+#[diagnostic(code(UnterminatedComment), severity(Error))]
+pub struct UnterminatedComment {
+	#[label(primary, "This comment is not terminated by a `-->` sequence")]
+	comment: Span,
+}
+
+impl TokenDiagnostic for UnterminatedComment {
+	fn handle_token(token: &Token<'_>) -> Option<Self> {
+		let TokenType::Comment { terminated, .. } = token.ty else {
+			return None;
+		};
+
+		if terminated {
+			return None;
+		}
+
+		Some(Self {
+			comment: token.span,
+		})
+	}
+}