Swift Package Index

Build Information

Failed to build Observation, reference 0.0.2 (9e04c7), with Swift 6.3 for macOS (SPM) on 12 Apr 2026 12:36:40 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.70.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/0xLet/Observation.git
Reference: 0.0.2
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/0xLet/Observation
 * tag               0.0.2      -> FETCH_HEAD
HEAD is now at 9e04c70 Merge pull request #2 from 0xLeif/develop
Cloned https://github.com/0xLet/Observation.git
Revision (git rev-parse @):
9e04c7056782c73a8f2ad6cea43f71a1c5a9700b
SUCCESS checkout https://github.com/0xLet/Observation.git at 0.0.2
Fetching https://github.com/0xLeif/E.num
Fetching https://github.com/0xLeif/Chain
[1/130] Fetching e.num
[131/249] Fetching e.num, chain
Fetched https://github.com/0xLeif/E.num from cache (0.65s)
Fetched https://github.com/0xLeif/Chain from cache (0.65s)
Computing version for https://github.com/0xLeif/Chain
Computed https://github.com/0xLeif/Chain at 0.2.0 (1.34s)
Computing version for https://github.com/0xLeif/E.num
Computed https://github.com/0xLeif/E.num at 0.3.0 (0.66s)
Creating working copy for https://github.com/0xLeif/Chain
Working copy of https://github.com/0xLeif/Chain resolved at 0.2.0
Creating working copy for https://github.com/0xLeif/E.num
Working copy of https://github.com/0xLeif/E.num resolved at 0.3.0
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
{
  "identity": ".resolve-product-dependencies",
  "name": "resolve-dependencies",
  "url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "version": "unspecified",
  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "traits": [
    "default"
  ],
  "dependencies": [
    {
      "identity": "observation",
      "name": "Observation",
      "url": "https://github.com/0xLet/Observation.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Observation",
      "traits": [
        "default"
      ],
      "dependencies": [
        {
          "identity": "chain",
          "name": "Chain",
          "url": "https://github.com/0xLeif/Chain",
          "version": "0.3.0",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Chain",
          "traits": [
            "default"
          ],
          "dependencies": [
            {
              "identity": "e.num",
              "name": "E",
              "url": "https://github.com/0xLeif/E.num",
              "version": "0.3.0",
              "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/E.num",
              "traits": [
                "default"
              ],
              "dependencies": [
              ]
            }
          ]
        }
      ]
    }
  ]
}
Fetching https://github.com/0xLet/Observation.git
[1/61] Fetching observation
Fetched https://github.com/0xLet/Observation.git from cache (0.62s)
Fetching https://github.com/0xLeif/Chain from cache
Fetched https://github.com/0xLeif/Chain from cache (0.40s)
Computing version for https://github.com/0xLeif/Chain
Computed https://github.com/0xLeif/Chain at 0.3.0 (1.09s)
Fetching https://github.com/0xLeif/E.num from cache
Fetched https://github.com/0xLeif/E.num from cache (0.41s)
Computing version for https://github.com/0xLeif/E.num
Computed https://github.com/0xLeif/E.num at 0.3.0 (0.47s)
Creating working copy for https://github.com/0xLeif/E.num
Working copy of https://github.com/0xLeif/E.num resolved at 0.3.0
Creating working copy for https://github.com/0xLeif/Chain
Working copy of https://github.com/0xLeif/Chain resolved at 0.3.0
Creating working copy for https://github.com/0xLet/Observation.git
Working copy of https://github.com/0xLet/Observation.git resolved at 0.0.2 (9e04c70)
warning: '.resolve-product-dependencies': dependency 'observation' is not used by any target
Found 1 product dependencies
  - Chain
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.3
Building package at path:  $PWD
https://github.com/0xLet/Observation.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun swift build --arch arm64
Building for debugging...
[0/4] Write sources
[3/4] Write swift-version--6988338F2F200930.txt
[5/9] Emitting module E
[6/9] Compiling E Function.swift
[7/9] Compiling E Control.swift
[8/9] Compiling E Variable.swift
[9/9] Compiling E State.swift
[10/11] Emitting module Chain
[11/11] Compiling Chain Chain.swift
error: emit-module command failed with exit code 1 (use -v to see invocation)
[12/13] Emitting module Observation
<unknown>:0: error: circular dependency between modules 'Observation' and 'Foundation'
[13/13] Compiling Observation ObservedValue.swift
<unknown>:0: error: circular dependency between modules 'Observation' and 'Foundation'
BUILD FAILURE 6.3 macosSpm