Forbid unsafe code

src/grm/main.rs

@@ -1,3 +1,5 @@
+#![forbid(unsafe_code)]
+
 use std::path::Path;
 use std::process;
 

src/lib.rs

@@ -1,5 +1,6 @@
 #![feature(io_error_more)]
 #![feature(const_option_ext)]
+#![forbid(unsafe_code)]
 
 use std::path::Path;