Include the missing fragment key and args when no matching Contract m…

…ethod or event is present (ethers-io#3809).

src.ts/contract/contract.ts

@@ -251,7 +251,8 @@ function buildWrappedMethod<A extends Array<any> = Array<any>, R = any, D extend
  const getFragment = function(...args: ContractMethodArgs<A>): FunctionFragment {
  const fragment = contract.interface.getFunction(key, args);
  assert(fragment, "no matching fragment", "UNSUPPORTED_OPERATION", {
- operation: "fragment"
+ operation: "fragment",
+ info: { key, args }
  });
  return fragment;
  }
@@ -348,7 +349,8 @@ function buildWrappedMethod<A extends Array<any> = Array<any>, R = any, D extend
  get: () => {
  const fragment = contract.interface.getFunction(key);
  assert(fragment, "no matching fragment", "UNSUPPORTED_OPERATION", {
- operation: "fragment"
+ operation: "fragment",
+ info: { key }
  });
  return fragment;
  }
@@ -363,7 +365,8 @@ function buildWrappedEvent<A extends Array<any> = Array<any>>(contract: BaseCont
  const fragment = contract.interface.getEvent(key, args);
 
  assert(fragment, "no matching fragment", "UNSUPPORTED_OPERATION", {
- operation: "fragment"
+ operation: "fragment",
+ info: { key, args }
  });
 
  return fragment;
@@ -388,7 +391,8 @@ function buildWrappedEvent<A extends Array<any> = Array<any>>(contract: BaseCont
  const fragment = contract.interface.getEvent(key);
 
  assert(fragment, "no matching fragment", "UNSUPPORTED_OPERATION", {
- operation: "fragment"
+ operation: "fragment",
+ info: { key }
  });
 
  return fragment;