Merge pull request #1219 from ethereum/yann300-patch-15

remix-solidity/src/compiler/compiler.js

@@ -370,9 +370,19 @@ function Compiler (handleImportCall) {
     }
     return version
   }
-
+  
   function updateInterface (data) {
     txHelper.visitContracts(data.contracts, (contract) => {
+      if (!contract.object.abi) contract.object.abi = []
+      if (language === 'Yul' && contract.object.abi.length === 0) {
+        // yul compiler does not return any abi,
+        // we default to accept the fallback function (which expect raw data as argument).
+        contract.object.abi.push({
+          'payable': true,
+          'stateMutability': 'payable',
+          'type': 'fallback'
+        })
+      }
       data.contracts[contract.file][contract.name].abi = solcABI.update(truncateVersion(currentVersion), contract.object.abi)
     })
     return data