diff --git a/Cargo.toml b/Cargo.toml
index 900448f7..92064c25 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,6 +22,10 @@ spans = ["wasm-bindgen-macro/spans"]
 std = []
 serde-serialize = ["serde", "serde_json", "std"]
 
+# This is only for debugging wasm-bindgen! No stability guarantees, so enable
+# this at your own peril!
+xxx_debug_only_print_generated_code = ["wasm-bindgen-macro/xxx_debug_only_print_generated_code"]
+
 [dependencies]
 wasm-bindgen-macro = { path = "crates/macro", version = "=0.2.11" }
 serde = { version = "1.0", optional = true }
diff --git a/crates/macro/Cargo.toml b/crates/macro/Cargo.toml
index d8562edf..038a0666 100644
--- a/crates/macro/Cargo.toml
+++ b/crates/macro/Cargo.toml
@@ -15,6 +15,7 @@ proc-macro = true
 
 [features]
 spans = ["proc-macro2/nightly", "wasm-bindgen-backend/spans"]
+xxx_debug_only_print_generated_code = []
 
 [dependencies]
 syn = { version = '0.14', features = ['full'] }
diff --git a/crates/macro/src/lib.rs b/crates/macro/src/lib.rs
old mode 100644
new mode 100755
index 772abd7c..3b787dc8
--- a/crates/macro/src/lib.rs
+++ b/crates/macro/src/lib.rs
@@ -20,7 +20,9 @@ pub fn wasm_bindgen(attr: TokenStream, input: TokenStream) -> TokenStream {
     program.push_item(item, Some(opts), &mut ret);
     program.to_tokens(&mut ret);
 
-    // println!("{}", ret);
+    if cfg!(feature = "xxx_debug_only_print_generated_code") {
+        println!("{}", ret);
+    }
 
     ret.into()
 }