trie: test for edgecase in VerifyRangeProof

[darioush]

This is probably a case where I am setting up something incorrectly, though the test fails when I remove the 1st elements of keys and vals (but passes otherwise). I was hoping you could take a look, since I couldn't exactly figure it out.

I'm assuming it's because there's a shared prefix on the keys, though not sure.

This is the stack trace I am getting:

panic: trie.hashNode: invalid node: <a94e2bd8ee1e6b49b14831e8bd8a7fa01f4582bd1c22e514468c62ee05ca144e>

goroutine 19 [running]:
testing.tRunner.func1.2({0x43a35a0, 0xc000212620})
	/usr/local/Cellar/go/1.17.2/libexec/src/testing/testing.go:1209 +0x36c
testing.tRunner.func1()
	/usr/local/Cellar/go/1.17.2/libexec/src/testing/testing.go:1212 +0x3b6
panic({0x43a35a0, 0xc000212620})
	/usr/local/Cellar/go/1.17.2/libexec/src/runtime/panic.go:1047 +0x266
github.com/ethereum/go-ethereum/trie.hasRightElement({0x445dc38, 0xc00018ea00}, {0xc0001a2ac0, 0x20, 0x40})
	/.../go-ethereum/trie/proof.go:431 +0x579
github.com/ethereum/go-ethereum/trie.VerifyRangeProof({0x60, 0x78, 0xfa, 0xa7, 0x31, 0x9c, 0x98, 0x7c, 0x67, 0xe5, ...}, ...)
	/.../go-ethereum/trie/proof.go:566 +0x10eb

[holiman]

Thanks for the PR! Good find

[holiman]

I've rebased this on master, and removed the todo left there. Should be good to go now

[holiman]

LGTM