008 tap nested continuation

✓ Passing This code compiles and runs correctly.

Code

// Test 058: Parse Tap with Nested Continuation
// MUST_COMPILE_ONLY
//
// This test verifies that the parser correctly nests continuations
// based on indentation, not flattening them into a single array.
//
// When we write:
//   ~source -> * | Transition t |> log() | done |> _
//
// The parser should create:
//   tap.continuations[0] = { branch: "Transition", nested: [...] }
//   tap.continuations[0].nested[0] = { branch: "done", ... }
//
// NOT:
//   tap.continuations[0] = { branch: "Transition", ... }
//   tap.continuations[1] = { branch: "done", ... }  // WRONG - should be nested!

const std = @import("std");
~import "$std/taps"

~event log { data: ?[]const u8 }
| done {}

~proc log {
    return .{ .done = .{} };
}

// THE TAP TO ANALYZE:
// This has a nested continuation: | Transition |> log() | done |> _
// The | done |> line is INDENTED, so it should be NESTED under Transition
~tap(* -> *)
| Profile p |> log(data: p.destination)
    | done |> _
input.kz

Expected AST

{
  "module_annotations": [],
  "items": [
    {
      "type": "import_decl",
      "path": "$std/compiler",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 2,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 2,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 3,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 4,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 5,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 6,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 7,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 8,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 9,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 10,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 11,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 12,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 13,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 14,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 15,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 16,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 17,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 19,
        "col": 0
      }
    },
    {
      "type": "import_decl",
      "path": "$std/taps",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 21,
        "col": 0
      }
    },
    {
      "type": "event_decl",
      "name": "log",
      "path": [
        "log"
      ],
      "module": "input",
      "input": {
        "fields": [
          {
            "name": "data",
            "type": "?[]const u8",
            "is_source": false,
            "is_file": false,
            "is_embed_file": false,
            "is_expression": false,
            "is_invocation_meta": false
          }
        ]
      },
      "branches": [
        {
          "name": "done",
          "payload": {
            "fields": []
          }
        }
      ],
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 24,
        "col": 0
      }
    },
    {
      "type": "proc_decl",
      "event_name": "log",
      "path": [
        "log"
      ],
      "module": "input",
      "target": "zig",
      "inline_flows": [],
      "is_pure": false,
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 28,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 29,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 30,
        "col": 0
      }
    },
    {
      "type": "host_line",
      "module": "input",
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 31,
        "col": 0
      }
    },
    {
      "type": "flow",
      "invocation": {
        "event": [
          "tap"
        ],
        "args": [
          {
            "name": "* -> *",
            "value": "* -> *"
          }
        ],
        "variant": null
      },
      "continuations": [
        {
          "branch": "Profile",
          "binding": "p",
          "binding_type": "branch_payload",
          "step": {
            "type": "invocation",
            "invocation": {
              "event": [
                "log"
              ],
              "args": [
                {
                  "name": "data",
                  "value": "p.destination"
                }
              ],
              "variant": null
            }
          },
          "continuations": [
            {
              "branch": "done",
              "binding": null,
              "binding_type": "branch_payload",
              "step": {
                "type": "terminal"
              },
              "continuations": []
            }
          ]
        }
      ],
      "pre_label": null,
      "post_label": null,
      "location": {
        "file": "tests/regression/200_COMPILER_FEATURES/210_PARSER/210_008_tap_nested_continuation/input.kz",
        "line": 32,
        "col": 0
      }
    }
  ]
}

Test Configuration

PARSER_TEST
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