small fixes

test.zr

@@ -1,4 +1,8 @@
 func run_test[x: String] : I64
+    // requires stdin
+    if strcmp(x, "guess_number.zr") == 0
+        return 0
+
     printf("\033[93mBuilding %s...\033[0m", x)
     let cmd: String = String.concat("./target/release/zern examples/", x)
 
@@ -14,9 +18,8 @@ func run_test[x: String] : I64
     if system("./out") != 0
         exit(1)
     let run_end_time: I64 = OS.time()
-    
+
     printf("\033[93mRunning %s...\033[0m %ldms\n", x, run_end_time - run_start_time)
-    return 0
 
 func main[] : I64
     system("cargo build --release")