repl: add output when leaving from c-d

closes #10

src/main.zig

@@ -109,7 +109,10 @@ pub fn doRepl(allocator: *std.mem.Allocator, args_it: var) !void {
         lang.reset();
 
         var rd_line = readline.readline(c"> ");
-        if (rd_line == null) break;
+        if (rd_line == null) {
+            std.debug.warn("leaving from eof\n");
+            break;
+        }
         readline.add_history(rd_line);
         //defer std.heap.c_allocator.destroy(rd_line);
 
@@ -137,6 +140,8 @@ pub fn doRepl(allocator: *std.mem.Allocator, args_it: var) !void {
         } else if (std.mem.eql(u8, line, "quit") or std.mem.eql(u8, line, "q")) {
             std.debug.warn("leaving\n");
             break;
+        } else if (std.mem.startsWith(u8, line, "#")) {
+            continue;
         }
 
         var cmds_parsed = lang.parse(line) catch |err| {