{"record":{"id":"1942f2fbce5f23c8","repo":"ethereum/go-ethereum","slug":"updatestem-is-not-implemented-for-transitiontrie","errorCode":null,"errorMessage":"UpdateStem is not implemented for TransitionTrie","messagePattern":"UpdateStem is not implemented for TransitionTrie","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"trie/transitiontrie/transition.go","lineNumber":245,"sourceCode":"// If the trie does not contain a value for key, the returned proof contains all\n// nodes of the longest existing prefix of the key (at least the root), ending\n// with the node that proves the absence of the key.\nfunc (t *TransitionTrie) Prove(key []byte, proofDb ethdb.KeyValueWriter) error {\n\tpanic(\"not implemented\") // TODO: Implement\n}\n\n// IsUBT returns true if the trie is verkle-tree based\nfunc (t *TransitionTrie) IsUBT() bool {\n\t// For all intents and purposes, the calling code should treat this as a verkle trie\n\treturn true\n}\n\n// UpdateStem updates a group of values, given the stem they are using. If\n// a value already exists, it is overwritten.\n// TODO: This is Verkle-specific and requires access to private fields.\n// Not currently used in the codebase.\nfunc (t *TransitionTrie) UpdateStem(key []byte, values [][]byte) error {\n\tpanic(\"UpdateStem is not implemented for TransitionTrie\")\n}\n\n// Copy creates a deep copy of the transition trie.\nfunc (t *TransitionTrie) Copy() *TransitionTrie {\n\treturn &TransitionTrie{\n\t\toverlay: t.overlay.Copy(),\n\t\t// base in immutable, so there is no need to copy it\n\t\tbase:    t.base,\n\t\tstorage: t.storage,\n\t}\n}\n\n// UpdateContractCode updates the contract code for the given address.\nfunc (t *TransitionTrie) UpdateContractCode(addr common.Address, codeHash common.Hash, code []byte) error {\n\treturn t.overlay.UpdateContractCode(addr, codeHash, code)\n}\n\n// Witness returns a set containing all trie nodes that have been accessed.","sourceCodeStart":227,"sourceCodeEnd":263,"githubUrl":"https://github.com/ethereum/go-ethereum/blob/6bb0588ad8e7f922e4ad5580f51265a4097af08f/trie/transitiontrie/transition.go#L227-L263","documentation":"Error \"UpdateStem is not implemented for TransitionTrie\" thrown in ethereum/go-ethereum.","triggerScenarios":"Calling UpdateStem on a TransitionTrie; the method is a Verkle-specific stub on the transition wrapper.","commonSituations":"Experimental Verkle transition tooling touching stems via the transition abstraction.","solutions":["TransitionTrie.UpdateStem is not implemented. Apply stem updates to the underlying Verkle (overlay) trie directly instead of through the TransitionTrie wrapper."],"exampleFix":"// Update the overlay verkle trie stem-by-stem:\noverlay := tt.Overlay()\nif err := overlay.UpdateStem(stem, values); err != nil { return err }","handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"6bb0588ad8e7f922e4ad5580f51265a4097af08f","analyzedAt":"2026-08-15T10:06:53.996Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}