From 3962b3c38d38acbdf10ec16cee76535510e20fb9 Mon Sep 17 00:00:00 2001
From: Hans Krutzer <git@mails.pixelspaceships.com>
Date: Sat, 13 Dec 2025 11:37:00 +0100
Subject: [PATCH] fix: Integer underflow in lexer error message formatting

---
 src/lexer.rs                            |  2 +-
 tests/interpreter/cases/call/basic.yaml | 11 ++++++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/lexer.rs b/src/lexer.rs
index 442c38f..e01eb77 100644
--- a/src/lexer.rs
+++ b/src/lexer.rs
@@ -203,7 +203,7 @@ impl Source {
 
         let line_str = format!("{line}");
         let line_num_width = line_str.len() + 1;
-        let col_spaces = col as usize - 1;
+        let col_spaces = (col as usize).saturating_sub(1);
 
         format!(
             "\n--> {}:{}:{}\n{:<line_num_width$}|\n\
diff --git a/tests/interpreter/cases/call/basic.yaml b/tests/interpreter/cases/call/basic.yaml
index cd8ae64..9c31026 100644
--- a/tests/interpreter/cases/call/basic.yaml
+++ b/tests/interpreter/cases/call/basic.yaml
@@ -75,4 +75,13 @@ cases:
         }
     query: data.test
     error: expects numeric argument.
-    
+
+  - note: multiline-member-access-should-error
+    data: {}
+    modules:
+      - |
+        package test
+        output := regex.
+        match("^a", "b")
+    query: data.test
+    error: invalid whitespace between . and identifier