Detect lines as they come in+sprintf in assert so it gets optimized away on release mode :)

assert/assert.go

@@ -1,11 +1,13 @@
 package assert
 
 import (
+	"fmt"
+
 	"github.com/bloeys/nterm/consts"
 )
 
-func T(check bool, msg string) {
+func T(check bool, msg string, args ...any) {
 	if consts.Mode_Debug && !check {
-		panic("Assert failed: " + msg)
+		panic("Assert failed: " + fmt.Sprintf(msg, args...))
 	}
 }