The original REPL loop had an if-else structure where the else branch (handling fgets failure) contained a return statement, making the code after the if-else block unreachable. This commit restructures the loop by inverting the condition: when fgets fails, the loop breaks instead of returning, allowing the subsequent wrenFreeVM call to execute. Additionally, enables CLANG_WARN_UNREACHABLE_CODE in both Debug and Release Xcode build configurations to catch similar issues in the future.
Bob Nystrom
4343b95c04