emberjs/ember.js · error · Error

Unexpected high level opcode ${op[0]}

Error message

Unexpected high level opcode ${op[0]}

What it means

Error "Unexpected high level opcode ${op[0]}" thrown in emberjs/ember.js.

Source

Thrown at packages/@glimmer/opcode-compiler/lib/opcode-builder/encoder.ts:125

        andThen(name, meta.moduleName);

        break;
      }

      case HighLevelResolutionOpcodes.TemplateLocal: {
        let [, valueIndex, then] = op;
        let value = expect(
          meta.scopeValues,
          'BUG: Attempted to get a template local, but template does not have any'
        )[valueIndex];

        then(constants.value(value));

        break;
      }

      default:
        throw new Error(`Unexpected high level opcode ${op[0]}`);
    }
  }
}

export class EncoderImpl implements Encoder {
  private labelsStack = new Stack<Labels>();
  private encoder: InstructionEncoder = new InstructionEncoderImpl([]);
  private errors: EncoderError[] = [];
  private handle: number;

  constructor(
    private heap: ProgramHeap,
    private meta: BlockMetadata,
    private stdlib?: STDLib
  ) {
    this.handle = heap.malloc();
  }

View on GitHub (pinned to 26f97246a8)

When it happens

Trigger: Thrown at packages/@glimmer/opcode-compiler/lib/opcode-builder/encoder.ts:125 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of emberjs/ember.js@26f97246a8 (2026-09-01). Data as JSON: /api/errors/b25361e762b981f2. Report an issue: GitHub.