fix prettyPrint() crash

Fixes an edge case when the error happens on the first character of the next line

Author: Prevter

include/rift/errors/compile.hpp

@@ -47,8 +47,13 @@ namespace rift {
             while (lineEnd > m_endIndex && m_source[lineEnd] == ' ') {
                 lineEnd--;
             }
-
-            return fmt::format("{}\n{}\n{:>{}}", m_message, m_source.substr(lineStart, lineEnd - lineStart), std::string(length, '^'), m_index - lineStart);
+            return fmt::format(
+                "{}\n{}\n{:>{}}",
+                m_message,
+                m_source.substr(lineStart, lineEnd - lineStart),
+                std::string(length, '^'),
+                m_index - std::min(lineStart, m_index)
+            );
         }
 
     private:

include/rift/errors/runtime.hpp

@@ -47,8 +47,13 @@ namespace rift {
             while (lineEnd > m_endIndex && source[lineEnd] == ' ') {
                 lineEnd--;
             }
-
-            return fmt::format("{}\n{}\n{:>{}}", m_message, source.substr(lineStart, lineEnd - lineStart), std::string(length, '^'), m_index - lineStart);
+            return fmt::format(
+                "{}\n{}\n{:>{}}",
+                m_message,
+                source.substr(lineStart, lineEnd - lineStart),
+                std::string(length, '^'),
+                m_index - std::min(lineStart, m_index)
+            );
         }
 
     private: