Check that the HRPs generated in BOLT 11 `RawHrp` are always valid

...in `debug_assertions`.

diff --git a/lightning-invoice/src/lib.rs b/lightning-invoice/src/lib.rs
index 36370896052f33989ed5a853495f6bcc5a15080d..f696e3545f94e964cd792d54eb28cb192e7275bb 100644 (file)
--- a/lightning-invoice/src/lib.rs
+++ b/lightning-invoice/src/lib.rs
@@ -313,6 +313,7 @@ impl RawHrp {
        pub fn to_hrp(&self) -> bech32::Hrp {
                let hrp_str = self.to_string();
                let s = core::str::from_utf8(&hrp_str.as_bytes()).expect("HRP bytes should be ASCII");
+               debug_assert!(bech32::Hrp::parse(s).is_ok(), "We should always build BIP 173-valid HRPs");
                bech32::Hrp::parse_unchecked(s)
        }
 }