### Terraform Version ```shell Terraform v1.14.3 and v1.15.0-alpha20251203 ``` ### Terraform Configuration Files ```terraform # main.tf locals { empty_list = tolist([]) } output "result" { value = { items = length(local.empty_list) > 0 ? local.empty_list : [""] } } ``` After initial apply, change to: ```terraform # main.tf (modified) output "result" { value = { items = [""] } } ``` ### Debug Output ``` 2026-01-26T23:56:58.245+0900 [INFO] Terraform version: 1.14.3 2026-01-26T23:56:58.245+0900 [DEBUG] using github.com/hashicorp/go-tfe v1.94.0 2026-01-26T23:56:58.245+0900 [DEBUG] using github.com/hashicorp/hcl/v2 v2.24.0 2026-01-26T23:56:58.245+0900 [DEBUG] using github.com/hashicorp/terraform-svchost v0.1.1 2026-01-26T23:56:58.245+0900 [DEBUG] using github.com/zclconf/go-cty v1.16.3 2026-01-26T23:56:58.245+0900 [INFO] Go runtime version: go1.25.5 2026-01-26T23:56:58.245+0900 [INFO] CLI args: []string{"/Users/user/.tenv/Terraform/1.14.3/terraform", "plan", "-detailed-exitcode"} 2026-01-26T23:56:58.245+0900 [TRACE] Stdout is a terminal of width 197 2026-01-26T23:56:58.245+0900 [TRACE] Stderr is a terminal of width 197 2026-01-26T23:56:58.245+0900 [TRACE] Stdin is a terminal 2026-01-26T23:56:58.245+0900 [DEBUG] Attempting to open CLI config file: /Users/user/.terraformrc 2026-01-26T23:56:58.245+0900 [DEBUG] File doesn't exist, but doesn't need to. Ignoring. 2026-01-26T23:56:58.245+0900 [DEBUG] ignoring non-existing provider search directory terraform.d/plugins 2026-01-26T23:56:58.245+0900 [DEBUG] ignoring non-existing provider search directory /Users/user/.terraform.d/plugins 2026-01-26T23:56:58.245+0900 [DEBUG] ignoring non-existing provider search directory /Users/user/Library/Application Support/io.terraform/plugins 2026-01-26T23:56:58.245+0900 [DEBUG] ignoring non-existing provider search directory /Library/Application Support/io.terraform/plugins 2026-01-26T23:56:58.245+0900 [INFO] CLI command args: []string{"plan", "-detailed-exitcode"} 2026-01-26T23:56:58.246+0900 [TRACE] Meta.Backend: no config given or present on disk, so returning nil config 2026-01-26T23:56:58.246+0900 [TRACE] Meta.Backend: backend has not previously been initialized in this working directory 2026-01-26T23:56:58.246+0900 [TRACE] Meta.Backend: using default local state only (no backend configuration, and no existing initialized backend) 2026-01-26T23:56:58.246+0900 [TRACE] Meta.Backend: instantiated backend of type 2026-01-26T23:56:58.246+0900 [DEBUG] checking for provisioner in "." 2026-01-26T23:56:58.246+0900 [DEBUG] checking for provisioner in "/Users/user/.tenv/Terraform/1.14.3" 2026-01-26T23:56:58.246+0900 [TRACE] Meta.Backend: backend does not support operations, so wrapping it in a local backend 2026-01-26T23:56:58.247+0900 [INFO] backend/local: starting Plan operation 2026-01-26T23:56:58.247+0900 [TRACE] backend/local: requesting state manager for workspace "default" 2026-01-26T23:56:58.247+0900 [TRACE] backend/local: state manager for workspace "default" will: - read initial snapshot from terraform.tfstate - write new snapshots to terraform.tfstate - create any backup at terraform.tfstate.backup 2026-01-26T23:56:58.247+0900 [TRACE] backend/local: requesting state lock for workspace "default" 2026-01-26T23:56:58.248+0900 [TRACE] statemgr.Filesystem: preparing to manage state snapshots at terraform.tfstate 2026-01-26T23:56:58.248+0900 [TRACE] statemgr.Filesystem: existing snapshot has lineage "5fdcb357-d831-c31f-a57e-34771b229a62" serial 1 2026-01-26T23:56:58.248+0900 [TRACE] statemgr.Filesystem: locking terraform.tfstate using fcntl flock 2026-01-26T23:56:58.248+0900 [TRACE] statemgr.Filesystem: writing lock metadata to .terraform.tfstate.lock.info 2026-01-26T23:56:58.248+0900 [TRACE] backend/local: reading remote state for workspace "default" 2026-01-26T23:56:58.248+0900 [TRACE] statemgr.Filesystem: reading latest snapshot from terraform.tfstate 2026-01-26T23:56:58.249+0900 [TRACE] statemgr.Filesystem: read snapshot with lineage "5fdcb357-d831-c31f-a57e-34771b229a62" serial 1 2026-01-26T23:56:58.249+0900 [TRACE] backend/local: populating backendrun.LocalRun for current working directory 2026-01-26T23:56:58.249+0900 [TRACE] terraform.NewContext: starting 2026-01-26T23:56:58.249+0900 [TRACE] terraform.NewContext: complete 2026-01-26T23:56:58.249+0900 [TRACE] backend/local: requesting interactive input, if necessary 2026-01-26T23:56:58.249+0900 [TRACE] Context.Input: Prompting for provider arguments 2026-01-26T23:56:58.249+0900 [TRACE] backend/local: running validation operation 2026-01-26T23:56:58.249+0900 [DEBUG] Building and walking validate graph 2026-01-26T23:56:58.249+0900 [TRACE] building graph for walkValidate 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.ConfigTransformer 2026-01-26T23:56:58.249+0900 [TRACE] ConfigTransformer: Starting for path: 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.ActionTriggerConfigTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.ActionInvokePlanTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.RootVariableTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.ModuleVariableTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.variableValidationTransformer 2026-01-26T23:56:58.249+0900 [TRACE] variableValidationTransformer: adding validation nodes for any existing variable evaluation nodes 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.LocalTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.OutputTransformer 2026-01-26T23:56:58.249+0900 [TRACE] OutputTransformer: adding result as *terraform.nodeExpandOutput 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.checkTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.OrphanResourceInstanceTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.StateTransformer 2026-01-26T23:56:58.249+0900 [TRACE] StateTransformer: pointless no-op call, creating no nodes at all 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.AttachStateTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.OrphanOutputTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.AttachResourceConfigTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.graphTransformerMulti 2026-01-26T23:56:58.249+0900 [TRACE] (graphTransformerMulti) Executing graph transform *terraform.externalProviderTransformer 2026-01-26T23:56:58.249+0900 [TRACE] (graphTransformerMulti) Completed graph transform *terraform.externalProviderTransformer with new graph: local.empty_list (expand) - *terraform.nodeExpandLocal output.result (expand) - *terraform.nodeExpandOutput ------ 2026-01-26T23:56:58.249+0900 [TRACE] (graphTransformerMulti) Executing graph transform *terraform.ProviderConfigTransformer 2026-01-26T23:56:58.249+0900 [TRACE] (graphTransformerMulti) Completed graph transform *terraform.ProviderConfigTransformer (no changes) 2026-01-26T23:56:58.249+0900 [TRACE] (graphTransformerMulti) Executing graph transform *terraform.MissingProviderTransformer 2026-01-26T23:56:58.249+0900 [TRACE] (graphTransformerMulti) Completed graph transform *terraform.MissingProviderTransformer (no changes) 2026-01-26T23:56:58.249+0900 [TRACE] (graphTransformerMulti) Executing graph transform *terraform.ProviderTransformer 2026-01-26T23:56:58.249+0900 [TRACE] (graphTransformerMulti) Completed graph transform *terraform.ProviderTransformer (no changes) 2026-01-26T23:56:58.249+0900 [TRACE] (graphTransformerMulti) Executing graph transform *terraform.PruneProviderTransformer 2026-01-26T23:56:58.249+0900 [TRACE] (graphTransformerMulti) Completed graph transform *terraform.PruneProviderTransformer (no changes) 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.RemovedModuleTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.AttachSchemaTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.ModuleExpansionTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.ExternalReferenceTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.ReferenceTransformer 2026-01-26T23:56:58.249+0900 [DEBUG] ReferenceTransformer: "output.result (expand)" references: [] 2026-01-26T23:56:58.249+0900 [DEBUG] ReferenceTransformer: "local.empty_list (expand)" references: [] 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.AttachDependenciesTransformer 2026-01-26T23:56:58.249+0900 [TRACE] AttachDependenciesTransformer: output.result (expand) depends on [] 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.attachDataResourceDependsOnTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.DestroyEdgeTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.pruneUnusedNodesTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.TargetsTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.QueryTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.ForcedCBDTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.ephemeralResourceCloseTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.CloseProviderTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.CloseRootModuleTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.TransitiveReductionTransformer 2026-01-26T23:56:58.249+0900 [TRACE] Completed graph transform: local.empty_list (expand) - *terraform.nodeExpandLocal output.result (expand) - *terraform.nodeExpandOutput root - *terraform.nodeCloseModule local.empty_list (expand) - *terraform.nodeExpandLocal output.result (expand) - *terraform.nodeExpandOutput ------ 2026-01-26T23:56:58.249+0900 [DEBUG] Starting graph walk: walkValidate 2026-01-26T23:56:58.249+0900 [TRACE] vertex "output.result (expand)": starting visit (*terraform.nodeExpandOutput) 2026-01-26T23:56:58.249+0900 [TRACE] vertex "output.result (expand)": does not belong to any module instance 2026-01-26T23:56:58.249+0900 [TRACE] vertex "local.empty_list (expand)": starting visit (*terraform.nodeExpandLocal) 2026-01-26T23:56:58.249+0900 [TRACE] vertex "local.empty_list (expand)": does not belong to any module instance 2026-01-26T23:56:58.249+0900 [TRACE] vertex "local.empty_list (expand)": expanding dynamic subgraph 2026-01-26T23:56:58.249+0900 [TRACE] Expanding local: adding local.empty_list as *terraform.NodeLocal 2026-01-26T23:56:58.249+0900 [TRACE] vertex "local.empty_list (expand)": entering dynamic subgraph 2026-01-26T23:56:58.249+0900 [TRACE] vertex "output.result (expand)": expanding dynamic subgraph 2026-01-26T23:56:58.249+0900 [TRACE] Expanding output: adding output.result as *terraform.NodeApplyableOutput 2026-01-26T23:56:58.249+0900 [TRACE] vertex "output.result (expand)": entering dynamic subgraph 2026-01-26T23:56:58.249+0900 [TRACE] vertex "local.empty_list": starting visit (*terraform.NodeLocal) 2026-01-26T23:56:58.249+0900 [TRACE] vertex "local.empty_list": belongs to 2026-01-26T23:56:58.249+0900 [TRACE] vertex "output.result": starting visit (*terraform.NodeApplyableOutput) 2026-01-26T23:56:58.249+0900 [TRACE] vertex "output.result": belongs to 2026-01-26T23:56:58.249+0900 [TRACE] vertex "local.empty_list": visit complete 2026-01-26T23:56:58.249+0900 [TRACE] setValue: Saving Create change for output.result in changeset 2026-01-26T23:56:58.249+0900 [TRACE] vertex "root": starting visit (terraform.graphNodeRoot) 2026-01-26T23:56:58.249+0900 [TRACE] vertex "root": does not belong to any module instance 2026-01-26T23:56:58.249+0900 [TRACE] vertex "root": visit complete 2026-01-26T23:56:58.249+0900 [TRACE] vertex "local.empty_list (expand)": dynamic subgraph completed successfully 2026-01-26T23:56:58.249+0900 [TRACE] vertex "local.empty_list (expand)": visit complete 2026-01-26T23:56:58.249+0900 [TRACE] setValue: Saving value for output.result in state 2026-01-26T23:56:58.249+0900 [TRACE] setValue: Saving value for output.result in state 2026-01-26T23:56:58.249+0900 [TRACE] vertex "output.result": visit complete 2026-01-26T23:56:58.249+0900 [TRACE] vertex "root": starting visit (terraform.graphNodeRoot) 2026-01-26T23:56:58.249+0900 [TRACE] vertex "root": does not belong to any module instance 2026-01-26T23:56:58.249+0900 [TRACE] vertex "root": visit complete 2026-01-26T23:56:58.249+0900 [TRACE] vertex "output.result (expand)": dynamic subgraph completed successfully 2026-01-26T23:56:58.249+0900 [TRACE] vertex "output.result (expand)": visit complete 2026-01-26T23:56:58.249+0900 [TRACE] vertex "root": starting visit (*terraform.nodeCloseModule) 2026-01-26T23:56:58.249+0900 [TRACE] vertex "root": does not belong to any module instance 2026-01-26T23:56:58.249+0900 [TRACE] vertex "root": visit complete 2026-01-26T23:56:58.249+0900 [INFO] backend/local: plan calling Plan 2026-01-26T23:56:58.249+0900 [DEBUG] Building and walking plan graph for NormalMode 2026-01-26T23:56:58.249+0900 [TRACE] building graph for walkPlan 2026-01-26T23:56:58.249+0900 [TRACE] Executing graph transform *terraform.ConfigTransformer 2026-01-26T23:56:58.249+0900 [TRACE] ConfigTransformer: Starting for path: 2026-01-26T23:56:58.250+0900 [TRACE] Executing graph transform *terraform.ActionTriggerConfigTransformer 2026-01-26T23:56:58.250+0900 [TRACE] Executing graph transform *terraform.ActionInvokePlanTransformer 2026-01-26T23:56:58.250+0900 [TRACE] Executing graph transform *terraform.RootVariableTransformer 2026-01-26T23:56:58.250+0900 [TRACE] Executing graph transform *terraform.ModuleVariableTransformer 2026-01-26T23:56:58.250+0900 [TRACE] Executing graph transform *terraform.variableValidationTransformer 2026-01-26T23:56:58.250+0900 [TRACE] variableValidationTransformer: adding validation nodes for any existing variable evaluation nodes 2026-01-26T23:56:58.250+0900 [TRACE] Executing graph transform *terraform.LocalTransformer 2026-01-26T23:56:58.250+0900 [TRACE] Executing graph transform *terraform.OutputTransformer 2026-01-26T23:56:58.250+0900 [TRACE] OutputTransformer: adding result as *terraform.nodeExpandOutput 2026-01-26T23:56:58.250+0900 [TRACE] Executing graph transform *terraform.checkTransformer 2026-01-26T23:56:58.250+0900 [TRACE] Executing graph transform *terraform.OrphanResourceInstanceTransformer 2026-01-26T23:56:58.250+0900 [TRACE] Executing graph transform *terraform.StateTransformer 2026-01-26T23:56:58.250+0900 [TRACE] StateTransformer: creating nodes for deposed instance objects only 2026-01-26T23:56:58.250+0900 [TRACE] Executing graph transform *terraform.AttachStateTransformer 2026-01-26T23:56:58.250+0900 [TRACE] Executing graph transform *terraform.OrphanOutputTransformer 2026-01-26T23:56:58.250+0900 [TRACE] Executing graph transform *terraform.AttachResourceConfigTransformer 2026-01-26T23:56:58.250+0900 [TRACE] Executing graph transform *terraform.graphTransformerMulti 2026-01-26T23:56:58.250+0900 [TRACE] (graphTransformerMulti) Executing graph transform *terraform.externalProviderTransformer 2026-01-26T23:56:58.250+0900 [TRACE] (graphTransformerMulti) Completed graph transform *terraform.externalProviderTransformer with new graph: local.empty_list (expand) - *terraform.nodeExpandLocal output.result (expand) - *terraform.nodeExpandOutput ------ 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Executing graph transform *terraform.ProviderConfigTransformer 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Completed graph transform *terraform.ProviderConfigTransformer (no changes) 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Executing graph transform *terraform.MissingProviderTransformer 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Completed graph transform *terraform.MissingProviderTransformer (no changes) 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Executing graph transform *terraform.ProviderTransformer 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Completed graph transform *terraform.ProviderTransformer (no changes) 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Executing graph transform *terraform.PruneProviderTransformer 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Completed graph transform *terraform.PruneProviderTransformer (no changes) 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.RemovedModuleTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.AttachSchemaTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.ModuleExpansionTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.ExternalReferenceTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.ReferenceTransformer 2026-01-26T23:56:58.251+0900 [DEBUG] ReferenceTransformer: "local.empty_list (expand)" references: [] 2026-01-26T23:56:58.251+0900 [DEBUG] ReferenceTransformer: "output.result (expand)" references: [] 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.AttachDependenciesTransformer 2026-01-26T23:56:58.251+0900 [TRACE] AttachDependenciesTransformer: output.result (expand) depends on [] 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.attachDataResourceDependsOnTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.DestroyEdgeTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.pruneUnusedNodesTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.TargetsTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.QueryTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.ForcedCBDTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.ephemeralResourceCloseTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.CloseProviderTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.CloseRootModuleTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.TransitiveReductionTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Completed graph transform: local.empty_list (expand) - *terraform.nodeExpandLocal output.result (expand) - *terraform.nodeExpandOutput root - *terraform.nodeCloseModule local.empty_list (expand) - *terraform.nodeExpandLocal output.result (expand) - *terraform.nodeExpandOutput ------ 2026-01-26T23:56:58.251+0900 [DEBUG] Starting graph walk: walkPlan 2026-01-26T23:56:58.251+0900 [TRACE] vertex "local.empty_list (expand)": starting visit (*terraform.nodeExpandLocal) 2026-01-26T23:56:58.251+0900 [TRACE] vertex "local.empty_list (expand)": does not belong to any module instance 2026-01-26T23:56:58.251+0900 [TRACE] vertex "local.empty_list (expand)": expanding dynamic subgraph 2026-01-26T23:56:58.251+0900 [TRACE] Expanding local: adding local.empty_list as *terraform.NodeLocal 2026-01-26T23:56:58.251+0900 [TRACE] vertex "output.result (expand)": starting visit (*terraform.nodeExpandOutput) 2026-01-26T23:56:58.251+0900 [TRACE] vertex "output.result (expand)": does not belong to any module instance 2026-01-26T23:56:58.251+0900 [TRACE] vertex "output.result (expand)": expanding dynamic subgraph 2026-01-26T23:56:58.251+0900 [TRACE] Expanding output: adding output.result as *terraform.NodeApplyableOutput 2026-01-26T23:56:58.251+0900 [TRACE] vertex "local.empty_list (expand)": entering dynamic subgraph 2026-01-26T23:56:58.251+0900 [TRACE] vertex "output.result (expand)": entering dynamic subgraph 2026-01-26T23:56:58.251+0900 [TRACE] vertex "local.empty_list": starting visit (*terraform.NodeLocal) 2026-01-26T23:56:58.251+0900 [TRACE] vertex "local.empty_list": belongs to 2026-01-26T23:56:58.251+0900 [TRACE] vertex "output.result": starting visit (*terraform.NodeApplyableOutput) 2026-01-26T23:56:58.251+0900 [TRACE] vertex "output.result": belongs to 2026-01-26T23:56:58.251+0900 [TRACE] vertex "local.empty_list": visit complete 2026-01-26T23:56:58.251+0900 [TRACE] vertex "root": starting visit (terraform.graphNodeRoot) 2026-01-26T23:56:58.251+0900 [TRACE] vertex "root": does not belong to any module instance 2026-01-26T23:56:58.251+0900 [TRACE] vertex "root": visit complete 2026-01-26T23:56:58.251+0900 [TRACE] setValue: Saving Update change for output.result in changeset 2026-01-26T23:56:58.251+0900 [TRACE] vertex "local.empty_list (expand)": dynamic subgraph completed successfully 2026-01-26T23:56:58.251+0900 [TRACE] setValue: Saving value for output.result in state 2026-01-26T23:56:58.251+0900 [TRACE] setValue: Saving value for output.result in state 2026-01-26T23:56:58.251+0900 [TRACE] vertex "output.result": visit complete 2026-01-26T23:56:58.251+0900 [TRACE] vertex "local.empty_list (expand)": visit complete 2026-01-26T23:56:58.251+0900 [TRACE] vertex "root": starting visit (terraform.graphNodeRoot) 2026-01-26T23:56:58.251+0900 [TRACE] vertex "root": does not belong to any module instance 2026-01-26T23:56:58.251+0900 [TRACE] vertex "root": visit complete 2026-01-26T23:56:58.251+0900 [TRACE] vertex "output.result (expand)": dynamic subgraph completed successfully 2026-01-26T23:56:58.251+0900 [TRACE] vertex "output.result (expand)": visit complete 2026-01-26T23:56:58.251+0900 [TRACE] vertex "root": starting visit (*terraform.nodeCloseModule) 2026-01-26T23:56:58.251+0900 [TRACE] vertex "root": does not belong to any module instance 2026-01-26T23:56:58.251+0900 [TRACE] vertex "root": visit complete 2026-01-26T23:56:58.251+0900 [TRACE] Plan is complete 2026-01-26T23:56:58.251+0900 [TRACE] Plan is applyable 2026-01-26T23:56:58.251+0900 [DEBUG] building apply graph to check for errors 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.ConfigTransformer 2026-01-26T23:56:58.251+0900 [TRACE] ConfigTransformer: Starting for path: 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.RootVariableTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.ModuleVariableTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.variableValidationTransformer 2026-01-26T23:56:58.251+0900 [TRACE] variableValidationTransformer: adding validation nodes for any existing variable evaluation nodes 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.LocalTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.OutputTransformer 2026-01-26T23:56:58.251+0900 [TRACE] OutputTransformer: adding result as *terraform.nodeExpandOutput 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.DiffTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.ActionTriggerConfigTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.ActionInvokeApplyTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.ActionDiffTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.DeferredTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.checkTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.AttachStateTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.OrphanOutputTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.AttachResourceConfigTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.graphTransformerMulti 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Executing graph transform *terraform.externalProviderTransformer 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Completed graph transform *terraform.externalProviderTransformer with new graph: local.empty_list (expand) - *terraform.nodeExpandLocal output.result (expand) - *terraform.nodeExpandOutput ------ 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Executing graph transform *terraform.ProviderConfigTransformer 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Completed graph transform *terraform.ProviderConfigTransformer (no changes) 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Executing graph transform *terraform.MissingProviderTransformer 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Completed graph transform *terraform.MissingProviderTransformer (no changes) 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Executing graph transform *terraform.ProviderTransformer 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Completed graph transform *terraform.ProviderTransformer (no changes) 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Executing graph transform *terraform.PruneProviderTransformer 2026-01-26T23:56:58.251+0900 [TRACE] (graphTransformerMulti) Completed graph transform *terraform.PruneProviderTransformer (no changes) 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.RemovedModuleTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.AttachSchemaTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.ModuleExpansionTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.ExternalReferenceTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.ReferenceTransformer 2026-01-26T23:56:58.251+0900 [DEBUG] ReferenceTransformer: "local.empty_list (expand)" references: [] 2026-01-26T23:56:58.251+0900 [DEBUG] ReferenceTransformer: "output.result (expand)" references: [] 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.AttachDependenciesTransformer 2026-01-26T23:56:58.251+0900 [TRACE] AttachDependenciesTransformer: output.result (expand) depends on [] 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.checkStartTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.ForcedCBDTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.DestroyEdgeTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.CBDEdgeTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.pruneUnusedNodesTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.TargetsTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.ephemeralResourceCloseTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.CloseProviderTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.CloseRootModuleTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Executing graph transform *terraform.TransitiveReductionTransformer 2026-01-26T23:56:58.251+0900 [TRACE] Completed graph transform: local.empty_list (expand) - *terraform.nodeExpandLocal output.result (expand) - *terraform.nodeExpandOutput root - *terraform.nodeCloseModule local.empty_list (expand) - *terraform.nodeExpandLocal output.result (expand) - *terraform.nodeExpandOutput ------ 2026-01-26T23:56:58.251+0900 [INFO] backend/local: plan operation completed No changes. Your infrastructure matches the configuration. Terraform has compared your real infrastructure against your configuration and found no differences, so no changes are needed. ──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── Note: You didn't use the -out option to save this plan, so Terraform can't guarantee to take exactly these actions if you run "terraform apply" now. 2026-01-26T23:56:58.251+0900 [TRACE] statemgr.Filesystem: removing lock metadata file .terraform.tfstate.lock.info 2026-01-26T23:56:58.251+0900 [TRACE] statemgr.Filesystem: unlocking terraform.tfstate using fcntl flock ``` ### Expected Behavior When the displayed output shows "No changes. Your infrastructure matches the configuration.", terraform plan -detailed-exitcode should return exit code 0. ### Actual Behavior The CLI displays "No changes. Your infrastructure matches the configuration." but returns exit code 2, indicating changes are present. ```bash $ terraform plan -detailed-exitcode No changes. Your infrastructure matches the configuration. Terraform has compared your real infrastructure against your configuration and found no differences, so no changes are needed. ──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── Note: You didn't use the -out option to save this plan, so Terraform can't guarantee to take exactly these actions if you run "terraform apply" now. $ echo $? 2 ``` ### Steps to Reproduce ```bash #!/bin/bash mkdir -p /tmp/tf-repro && cd /tmp/tf-repro # Step 1: Create initial config with conditional expression cat > main.tf << 'EOF' locals { empty_list = tolist([]) } output "result" { value = { items = length(local.empty_list) > 0 ? local.empty_list : [""] } } EOF # Step 2: Initialize and apply terraform init terraform apply -auto-approve # Step 3: Modify output to hardcoded value (same result, different expression) cat > main.tf << 'EOF' output "result" { value = { items = [""] } } EOF # Step 4: Run plan with detailed-exitcode terraform plan -detailed-exitcode echo "Exit code: $?" # Expected: 0, Actual: 2 ``` ### Additional Context Investigation suggests this is caused by two different comparison mechanisms: 1. Display logic ([`internal/command/jsonformat/jsondiff/diff.go:95`](https://github.com/hashicorp/terraform/blob/9fb1177c3566c247c72e6c36ca219463c4b6be2b/internal/command/jsonformat/jsondiff/diff.go#L95)): Uses `reflect.DeepEqual` on JSON-serialized data 2. Exit code logic ([`internal/terraform/node_output.go:727-734`](https://github.com/hashicorp/terraform/blob/9fb1177c3566c247c72e6c36ca219463c4b6be2b/internal/terraform/node_output.go#L727-L734)): Uses `cty.Value.Equals()` with strict type checking The conditional expression `length(...) > 0 ? list : [""]` produces a `list(string)` type (due to type unification), while the hardcoded `[""]` produces a `tuple([string])` type. The values are identical, but the types differ. - `reflect.DeepEqual` (JSON) → true → "No changes" displayed - `cty.Value.Equals()` (cty) → false → Action = Update → exit code 2 Workaround: Explicitly convert the type: ```terraform output "result" { value = { items = tolist([""]) } } ``` ### References - #37406 (similar issue for refresh-only mode, fixed by #37886) - #37886 (fix for refresh-only mode using RootOutputValuesEqual, does not address normal plan mode which uses `plan.Changes.Empty()`) ### Generative AI / LLM assisted development? Claude Code was used for: - Navigating Terraform source code to identify the root cause - Tracing the code paths for exit code determination vs. display logic All analysis results were independently verified by the reporter through: - Manual code review of the identified source files - Reproduction testing on Terraform v1.15.0-alpha20251203 - Confirmation that the issue persists after #37886 fix