[Bug] Anchor IDL not showing for program

[mcintyre94]

Describe the bug

A user asked on stackexchange why their anchor IDL doesn't show up on our Explorer: https://solana.stackexchange.com/questions/9569/idls-explorers-curiosity

Explorer link to their program: https://explorer.solana.com/address/propm845StqEBV57ZSnTe8EW8duzAxo5p7h4inhibXV?cluster=devnet

I took a look at Explorer and I think the code that fetches the IDL is this:

explorer/app/providers/anchor.tsx

Lines 10 to 37 in 5dcb646

	export function useAnchorProgram(programAddress: string, url: string): Program | null {
	const key = `${programAddress}-${url}`;
	const cacheEntry = cachedAnchorProgramPromises[key];
	if (cacheEntry === undefined) {
	const promise = Program.at(
	programAddress,
	new Provider(new Connection(url), new NodeWallet(Keypair.generate()), {})
	)
	.then(program => {
	cachedAnchorProgramPromises[key] = {
	__type: 'result',
	result: program,
	};
	})
	.catch(_ => {
	cachedAnchorProgramPromises[key] = { __type: 'result', result: null };
	});
	cachedAnchorProgramPromises[key] = {
	__type: 'promise',
	promise,
	};
	throw promise;
	} else if (cacheEntry.__type === 'promise') {
	throw cacheEntry.promise;
	}
	return cacheEntry.result;
	}

I put a debugger on line 26 and viewed the reported program on devnet, and got an error "Tuple enum variants not yet implemented."

Their IDL does work on solscan: https://solscan.io/account/propm845StqEBV57ZSnTe8EW8duzAxo5p7h4inhibXV?cluster=devnet#anchorProgramIDL

It also has a suspicious looking enum field:

I'm guessing we need to update our version of Anchor to parse the newest IDLs

To Reproduce
Steps to reproduce the behavior:

1. Go to https://explorer.solana.com/address/propm845StqEBV57ZSnTe8EW8duzAxo5p7h4inhibXV?cluster=devnet, No Anchor IDL
2. Go to https://solscan.io/account/propm845StqEBV57ZSnTe8EW8duzAxo5p7h4inhibXV?cluster=devnet#anchorProgramIDL, Anchor IDL displays

Example Links

• https://explorer.solana.com/address/propm845StqEBV57ZSnTe8EW8duzAxo5p7h4inhibXV?cluster=devnet

Expected behavior

Show the Anchor IDL on this program!

[ngundotra]

Closed by #374