Fix rustc nightly compiler error.

This works around a regression in nightly rustc that prevents type
inference from working properly.

Author: TheBlueMatt

lightning/src/ln/router.rs

@@ -1564,7 +1564,7 @@ mod tests {
 			assert_eq!(route.paths[0][0].fee_msat, 200);
 			assert_eq!(route.paths[0][0].cltv_expiry_delta, (13 << 8) | 1);
 			assert_eq!(route.paths[0][0].node_features.le_flags(), &vec![0b11]); // it should also override our view of their features
-			assert_eq!(route.paths[0][0].channel_features.le_flags(), &Vec::new()); // No feature flags will meet the relevant-to-channel conversion
+			assert_eq!(route.paths[0][0].channel_features.le_flags(), &Vec::<u8>::new()); // No feature flags will meet the relevant-to-channel conversion
 
 			assert_eq!(route.paths[0][1].pubkey, node3);
 			assert_eq!(route.paths[0][1].short_channel_id, 13);
@@ -1613,7 +1613,7 @@ mod tests {
 			assert_eq!(route.paths[0][0].fee_msat, 200);
 			assert_eq!(route.paths[0][0].cltv_expiry_delta, (13 << 8) | 1);
 			assert_eq!(route.paths[0][0].node_features.le_flags(), &vec![0b11]); // it should also override our view of their features
-			assert_eq!(route.paths[0][0].channel_features.le_flags(), &Vec::new()); // No feature flags will meet the relevant-to-channel conversion
+			assert_eq!(route.paths[0][0].channel_features.le_flags(), &Vec::<u8>::new()); // No feature flags will meet the relevant-to-channel conversion
 
 			assert_eq!(route.paths[0][1].pubkey, node3);
 			assert_eq!(route.paths[0][1].short_channel_id, 13);
@@ -1680,7 +1680,7 @@ mod tests {
 			assert_eq!(route.paths[0][0].fee_msat, 200);
 			assert_eq!(route.paths[0][0].cltv_expiry_delta, (13 << 8) | 1);
 			assert_eq!(route.paths[0][0].node_features.le_flags(), &vec![0b11]);
-			assert_eq!(route.paths[0][0].channel_features.le_flags(), &Vec::new()); // No feature flags will meet the relevant-to-channel conversion
+			assert_eq!(route.paths[0][0].channel_features.le_flags(), &Vec::<u8>::new()); // No feature flags will meet the relevant-to-channel conversion
 
 			assert_eq!(route.paths[0][1].pubkey, node3);
 			assert_eq!(route.paths[0][1].short_channel_id, 13);
@@ -1751,8 +1751,8 @@ mod tests {
 			assert_eq!(route.paths[0][4].short_channel_id, 8);
 			assert_eq!(route.paths[0][4].fee_msat, 100);
 			assert_eq!(route.paths[0][4].cltv_expiry_delta, 42);
-			assert_eq!(route.paths[0][4].node_features.le_flags(), &Vec::new()); // We dont pass flags in from invoices yet
-			assert_eq!(route.paths[0][4].channel_features.le_flags(), &Vec::new()); // We can't learn any flags from invoices, sadly
+			assert_eq!(route.paths[0][4].node_features.le_flags(), &Vec::<u8>::new()); // We dont pass flags in from invoices yet
+			assert_eq!(route.paths[0][4].channel_features.le_flags(), &Vec::<u8>::new()); // We can't learn any flags from invoices, sadly
 		}
 
 		{ // Simple test with outbound channel to 4 to test that last_hops and first_hops connect
@@ -1775,14 +1775,14 @@ mod tests {
 			assert_eq!(route.paths[0][0].fee_msat, 0);
 			assert_eq!(route.paths[0][0].cltv_expiry_delta, (8 << 8) | 1);
 			assert_eq!(route.paths[0][0].node_features.le_flags(), &vec![0b11]);
-			assert_eq!(route.paths[0][0].channel_features.le_flags(), &Vec::new()); // No feature flags will meet the relevant-to-channel conversion
+			assert_eq!(route.paths[0][0].channel_features.le_flags(), &Vec::<u8>::new()); // No feature flags will meet the relevant-to-channel conversion
 
 			assert_eq!(route.paths[0][1].pubkey, node7);
 			assert_eq!(route.paths[0][1].short_channel_id, 8);
 			assert_eq!(route.paths[0][1].fee_msat, 100);
 			assert_eq!(route.paths[0][1].cltv_expiry_delta, 42);
-			assert_eq!(route.paths[0][1].node_features.le_flags(), &Vec::new()); // We dont pass flags in from invoices yet
-			assert_eq!(route.paths[0][1].channel_features.le_flags(), &Vec::new()); // We can't learn any flags from invoices, sadly
+			assert_eq!(route.paths[0][1].node_features.le_flags(), &Vec::<u8>::new()); // We dont pass flags in from invoices yet
+			assert_eq!(route.paths[0][1].channel_features.le_flags(), &Vec::<u8>::new()); // We can't learn any flags from invoices, sadly
 		}
 
 		last_hops[0].fee_base_msat = 1000;
@@ -1818,8 +1818,8 @@ mod tests {
 			assert_eq!(route.paths[0][3].short_channel_id, 10);
 			assert_eq!(route.paths[0][3].fee_msat, 100);
 			assert_eq!(route.paths[0][3].cltv_expiry_delta, 42);
-			assert_eq!(route.paths[0][3].node_features.le_flags(), &Vec::new()); // We dont pass flags in from invoices yet
-			assert_eq!(route.paths[0][3].channel_features.le_flags(), &Vec::new()); // We can't learn any flags from invoices, sadly
+			assert_eq!(route.paths[0][3].node_features.le_flags(), &Vec::<u8>::new()); // We dont pass flags in from invoices yet
+			assert_eq!(route.paths[0][3].channel_features.le_flags(), &Vec::<u8>::new()); // We can't learn any flags from invoices, sadly
 		}
 
 		{ // ...but still use 8 for larger payments as 6 has a variable feerate
@@ -1860,8 +1860,8 @@ mod tests {
 			assert_eq!(route.paths[0][4].short_channel_id, 8);
 			assert_eq!(route.paths[0][4].fee_msat, 2000);
 			assert_eq!(route.paths[0][4].cltv_expiry_delta, 42);
-			assert_eq!(route.paths[0][4].node_features.le_flags(), &Vec::new()); // We dont pass flags in from invoices yet
-			assert_eq!(route.paths[0][4].channel_features.le_flags(), &Vec::new()); // We can't learn any flags from invoices, sadly
+			assert_eq!(route.paths[0][4].node_features.le_flags(), &Vec::<u8>::new()); // We dont pass flags in from invoices yet
+			assert_eq!(route.paths[0][4].channel_features.le_flags(), &Vec::<u8>::new()); // We can't learn any flags from invoices, sadly
 		}
 
 		{ // Test Router serialization/deserialization