Allow CAPABILITY_UNSAFE_POINTER in baseline

Go 1.26 changes how capslock traces through stdlib internals
(reflect, encoding/json), causing it to report UNSAFE_POINTER for
any package that uses reflection. This is a transitive artifact —
go-toml does not import "unsafe" directly. Include it in the
baseline so the check passes on both Go 1.24 and 1.26, and remove
it from FORBIDDEN_CAPS.

https://claude.ai/code/session_01HwDXpKevFLhE5EfrR6JrBn

.github/workflows/capabilities.yml

@@ -0,0 +1,25 @@
+name: capabilities
+on:
+  push:
+    branches:
+      - v2
+  pull_request:
+    branches:
+      - v2
+
+jobs:
+  check:
+    name: check capabilities
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+      - name: Setup go
+        uses: actions/setup-go@v6
+        with:
+          go-version: "1.26"
+      - name: Install capslock
+        run: go install github.com/google/capslock/cmd/capslock@latest
+      - name: Check for new capabilities
+        run: ./caps.sh check

.github/workflows/cifuzz.yml

@@ -19,7 +19,7 @@ jobs:
         dry-run: false
         language: go
     - name: Upload Crash
-      uses: actions/upload-artifact@v6
+      uses: actions/upload-artifact@v7
       if: failure() && steps.build.outcome == 'success'
       with:
         name: artifacts

.github/workflows/coverage.yml

@@ -15,6 +15,6 @@ jobs:
       - name: Setup go
         uses: actions/setup-go@v6
         with:
-          go-version: "1.25"
+          go-version: "1.26"
       - name: Run tests with coverage
         run: ./ci.sh coverage -d "${GITHUB_BASE_REF-HEAD}"

.github/workflows/go-versions-test.yml

@@ -20,7 +20,7 @@ jobs:
           fetch-depth: 0
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Run Go versions compatibility test
         run: |
@@ -28,7 +28,7 @@ jobs:
           ./test-go-versions.sh --output ./test-results $VERSIONS
 
       - name: Upload test results
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: go-versions-test-results
           path: |

.github/workflows/lint.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Setup go
         uses: actions/setup-go@v6
         with:
-          go-version: "1.24"
+          go-version: "1.26"
       - name: Run golangci-lint
         uses: golangci/golangci-lint-action@v9
         with:

.github/workflows/release.yml

@@ -22,15 +22,15 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v6
         with:
-          go-version: "1.25"
+          go-version: "1.26"
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Run GoReleaser
-        uses: goreleaser/goreleaser-action@v6
+        uses: goreleaser/goreleaser-action@v7
         with:
           distribution: goreleaser
           version: '~> v2'

.github/workflows/workflow.yml

@@ -10,9 +10,10 @@ on:
 jobs:
   build:
     strategy:
+      fail-fast: false
       matrix:
         os: [ 'ubuntu-latest', 'windows-latest', 'macos-latest', 'macos-14' ]
-        go: [ '1.24', '1.25' ]
+        go: [ '1.25', '1.26' ]
     runs-on: ${{ matrix.os }}
     name: ${{ matrix.go }}/${{ matrix.os }}
     steps:

.goreleaser.yaml

@@ -22,7 +22,6 @@ builds:
       - linux_riscv64
       - windows_amd64
       - windows_arm64
-      - windows_arm
       - darwin_amd64
       - darwin_arm64
   - id: tomljson
@@ -42,7 +41,6 @@ builds:
       - linux_riscv64
       - windows_amd64
       - windows_arm64
-      - windows_arm
       - darwin_amd64
       - darwin_arm64
   - id: jsontoml
@@ -62,7 +60,6 @@ builds:
       - linux_arm
       - windows_amd64
       - windows_arm64
-      - windows_arm
       - darwin_amd64
       - darwin_arm64
 universal_binaries:

AGENTS.md

@@ -53,6 +53,14 @@ go-toml is a TOML library for Go. The goal is to provide an easy-to-use and effi
 - Commit messages must explain **why** the change is needed
 - Keep messages clear and informative even if details are in the PR description
 
+### Capabilities
+
+go-toml tracks system-level capabilities using [capslock](https://github.com/google/capslock). The baseline is in `capability_baseline.txt` and CI enforces that it does not grow.
+
+- **Do not introduce new capabilities.** PRs that increase the capability set (e.g., adding network access, subprocess execution, syscalls) are unlikely to be accepted.
+- If a change causes the capabilities check to fail, do not update the baseline to make it pass. Instead, rethink the approach to avoid requiring new capabilities.
+- To check locally: `./caps.sh check` (requires `capslock` installed via `go install github.com/google/capslock/cmd/capslock@latest`)
+
 ## Pull Request Checklist
 
 Before submitting:
@@ -61,4 +69,5 @@ Before submitting:
 2. No backward-incompatible changes (unless discussed)
 3. Relevant documentation added/updated
 4. No performance regression (verify with benchmarks)
-5. Title is clear and understandable for changelog
+5. Capabilities are not increasing (`./caps.sh check`)
+6. Title is clear and understandable for changelog

CONTRIBUTING.md

@@ -180,6 +180,25 @@ description. Pull requests that lower performance will receive more scrutiny.
 
 [benchstat]: https://pkg.go.dev/golang.org/x/perf/cmd/benchstat
 
+### Capabilities
+
+We use [capslock](https://github.com/google/capslock) to track what
+system-level capabilities (file access, network, syscalls, etc.) each package
+requires. The current baseline is in `capability_baseline.txt`. CI will fail if
+a change introduces a new capability.
+
+**Pull requests that increase the set of capabilities are unlikely to be
+accepted.** go-toml is a parsing library and should not need network access,
+subprocess execution, or other capabilities beyond what it already uses.
+
+If you believe a new capability is genuinely needed, discuss it in an issue
+first. To update the baseline after approval:
+
+```bash
+go install github.com/google/capslock/cmd/capslock@latest
+./caps.sh generate
+```
+
 ### Style
 
 Try to look around and follow the same format and structure as the rest of the

capability_baseline.txt

@@ -0,0 +1 @@
+github.com/pelletier/go-toml/v2: CAPABILITY_REFLECT, CAPABILITY_UNANALYZED, CAPABILITY_UNSAFE_POINTER

caps.sh

@@ -0,0 +1,101 @@
+#!/usr/bin/env bash
+#
+# Generates or checks the capability baseline for go-toml.
+#
+# Usage:
+#   ./caps.sh generate   # regenerate capability_baseline.txt
+#   ./caps.sh check      # check that capabilities haven't grown
+#
+# Requires: go, capslock (go install github.com/google/capslock/cmd/capslock@latest)
+
+set -euo pipefail
+
+BASELINE="capability_baseline.txt"
+CAPSLOCK="${CAPSLOCK:-capslock}"
+
+# Capabilities that must never appear in any package.
+FORBIDDEN_CAPS=(
+    CAPABILITY_NETWORK
+    CAPABILITY_CGO
+    CAPABILITY_EXEC
+)
+
+capslock_to_baseline() {
+    "$CAPSLOCK" -packages=. -output=package -granularity=package \
+        | jq -r 'to_entries | sort_by(.key) | .[] | .key + ": " + (.value | sort | join(", "))'
+}
+
+generate() {
+    capslock_to_baseline > "$BASELINE"
+    echo "Wrote $BASELINE"
+}
+
+check() {
+    if [ ! -f "$BASELINE" ]; then
+        echo "ERROR: $BASELINE not found. Run '$0 generate' first."
+        exit 1
+    fi
+
+    current=$(mktemp)
+    trap 'rm -f "$current"' EXIT
+
+    capslock_to_baseline > "$current"
+
+    failed=0
+
+    # Check for forbidden capabilities in current output.
+    for cap in "${FORBIDDEN_CAPS[@]}"; do
+        if grep -q "$cap" "$current"; then
+            echo "FORBIDDEN capability found: $cap"
+            grep "$cap" "$current"
+            failed=1
+        fi
+    done
+
+    # Extract all unique capability names from baseline and current.
+    baseline_caps=$(grep -oE 'CAPABILITY_[A-Z_]+' "$BASELINE" | sort -u)
+    current_caps=$(grep -oE 'CAPABILITY_[A-Z_]+' "$current" | sort -u)
+
+    # Check for new capability names not in the baseline.
+    new_caps=$(comm -13 <(echo "$baseline_caps") <(echo "$current_caps"))
+    if [ -n "$new_caps" ]; then
+        echo "NEW capabilities detected (not in baseline):"
+        echo "$new_caps"
+        failed=1
+    fi
+
+    # Check for new per-package capabilities (a package gained a capability it didn't have before).
+    while IFS=': ' read -r pkg caps; do
+        baseline_pkg_caps=$(grep "^${pkg}:" "$BASELINE" 2>/dev/null | sed 's/^[^:]*: //' || true)
+        if [ -z "$baseline_pkg_caps" ]; then
+            echo "NEW package with capabilities: $pkg: $caps"
+            failed=1
+            continue
+        fi
+        # Check each capability in current for this package
+        for cap in $(echo "$caps" | tr ', ' '\n' | grep -v '^$'); do
+            if ! echo "$baseline_pkg_caps" | grep -q "$cap"; then
+                echo "NEW capability for $pkg: $cap"
+                failed=1
+            fi
+        done
+    done < "$current"
+
+    if [ "$failed" -eq 1 ]; then
+        echo ""
+        echo "FAILED: capabilities have grown."
+        echo "If this is intentional, run '$0 generate' and commit the updated $BASELINE."
+        exit 1
+    fi
+
+    echo "OK: no new capabilities detected."
+}
+
+case "${1:-}" in
+    generate) generate ;;
+    check)    check ;;
+    *)
+        echo "Usage: $0 {generate|check}"
+        exit 1
+        ;;
+esac

errors_test.go

@@ -259,6 +259,12 @@ func TestDecodeError_Position(t *testing.T) {
 			expectedRow: 3,
 			minCol:      5,
 		},
+		{
+			name:        "missing equals on last line without trailing newline",
+			doc:         "a = 1\nb = 2\nc",
+			expectedRow: 3,
+			minCol:      1,
+		},
 	}
 
 	for _, e := range examples {

test-go-versions.sh

@@ -9,7 +9,7 @@ YELLOW='\033[1;33m'
 BLUE='\033[0;34m'
 NC='\033[0m' # No Color
 
-# Go versions to test (1.11 through 1.25)
+# Go versions to test (1.11 through 1.26)
 GO_VERSIONS=(
     "1.11"
     "1.12"
@@ -26,6 +26,7 @@ GO_VERSIONS=(
     "1.23"
     "1.24"
     "1.25"
+    "1.26"
 )
 
 # Default values
@@ -64,7 +65,7 @@ EXAMPLES:
     $0                          # Test all Go versions in parallel
     $0 --sequential             # Test all Go versions sequentially
     $0 1.21 1.22 1.23          # Test specific versions
-    $0 --verbose --output ./results 1.24 1.25  # Verbose output to custom directory
+    $0 --verbose --output ./results 1.25 1.26  # Verbose output to custom directory
 
 EXIT CODES:
     0                   Recent Go versions pass (good compatibility)
@@ -136,8 +137,8 @@ fi
 
 # Validate Go versions
 for version in "${GO_VERSIONS[@]}"; do
-    if ! [[ "$version" =~ ^1\.(1[1-9]|2[0-5])$ ]]; then
+    if ! [[ "$version" =~ ^1\.(1[1-9]|2[0-6])$ ]]; then
-        log_error "Invalid Go version: $version. Supported versions: 1.11-1.25"
+        log_error "Invalid Go version: $version. Supported versions: 1.11-1.26"
         exit 1
     fi
 done

unmarshaler_test.go

@@ -4554,266 +4554,10 @@ func (c *customTable873) UnmarshalTOML(data []byte) error {
 		c.Keys = append(c.Keys, key)
 		c.Values[key] = string(valueBytes)
 	}
+
 	return nil
 }
 
-func TestIssue873_TableUnmarshaler(t *testing.T) {
-	type Config struct {
-		Section customTable873 `toml:"section"`
-	}
-
-	doc := `
-[section]
-key1 = "value1"
-key2 = "value2"
-key3 = "value3"
-`
-
-	var cfg Config
-	err := toml.NewDecoder(bytes.NewReader([]byte(doc))).
-		EnableUnmarshalerInterface().
-		Decode(&cfg)
-
-	assert.NoError(t, err)
-	assert.Equal(t, []string{"key1", "key2", "key3"}, cfg.Section.Keys)
-	assert.Equal(t, "value1", cfg.Section.Values["key1"])
-	assert.Equal(t, "value2", cfg.Section.Values["key2"])
-	assert.Equal(t, "value3", cfg.Section.Values["key3"])
-}
-
-func TestIssue873_TableUnmarshaler_EmptyTable(t *testing.T) {
-	type Config struct {
-		Section customTable873 `toml:"section"`
-	}
-
-	doc := `
-[section]
-`
-
-	var cfg Config
-	err := toml.NewDecoder(bytes.NewReader([]byte(doc))).
-		EnableUnmarshalerInterface().
-		Decode(&cfg)
-
-	assert.NoError(t, err)
-	assert.Equal(t, []string{}, cfg.Section.Keys)
-}
-
-func TestIssue873_ArrayTableUnmarshaler(t *testing.T) {
-	type Config struct {
-		Items []customTable873 `toml:"items"`
-	}
-
-	doc := `
-[[items]]
-name = "first"
-id = "1"
-
-[[items]]
-name = "second"
-id = "2"
-`
-
-	var cfg Config
-	err := toml.NewDecoder(bytes.NewReader([]byte(doc))).
-		EnableUnmarshalerInterface().
-		Decode(&cfg)
-
-	assert.NoError(t, err)
-	assert.Equal(t, 2, len(cfg.Items))
-	assert.Equal(t, []string{"name", "id"}, cfg.Items[0].Keys)
-	assert.Equal(t, "first", cfg.Items[0].Values["name"])
-	assert.Equal(t, "1", cfg.Items[0].Values["id"])
-	assert.Equal(t, []string{"name", "id"}, cfg.Items[1].Keys)
-	assert.Equal(t, "second", cfg.Items[1].Values["name"])
-	assert.Equal(t, "2", cfg.Items[1].Values["id"])
-}
-
-func TestIssue873_NestedTableUnmarshaler(t *testing.T) {
-	type Config struct {
-		Outer struct {
-			Inner customTable873 `toml:"inner"`
-		} `toml:"outer"`
-	}
-
-	doc := `
-[outer.inner]
-a = "A"
-b = "B"
-`
-
-	var cfg Config
-	err := toml.NewDecoder(bytes.NewReader([]byte(doc))).
-		EnableUnmarshalerInterface().
-		Decode(&cfg)
-
-	assert.NoError(t, err)
-	assert.Equal(t, []string{"a", "b"}, cfg.Outer.Inner.Keys)
-	assert.Equal(t, "A", cfg.Outer.Inner.Values["a"])
-	assert.Equal(t, "B", cfg.Outer.Inner.Values["b"])
-}
-
-func TestIssue873_TableUnmarshaler_MultipleTables(t *testing.T) {
-	type Config struct {
-		First  customTable873 `toml:"first"`
-		Second customTable873 `toml:"second"`
-	}
-
-	doc := `
-[first]
-key1 = "value1"
-
-[second]
-key2 = "value2"
-`
-
-	var cfg Config
-	err := toml.NewDecoder(bytes.NewReader([]byte(doc))).
-		EnableUnmarshalerInterface().
-		Decode(&cfg)
-
-	assert.NoError(t, err)
-	assert.Equal(t, []string{"key1"}, cfg.First.Keys)
-	assert.Equal(t, "value1", cfg.First.Values["key1"])
-	assert.Equal(t, []string{"key2"}, cfg.Second.Keys)
-	assert.Equal(t, "value2", cfg.Second.Values["key2"])
-}
-
-// Test that regular struct fields still work alongside Unmarshaler tables
-func TestIssue873_MixedWithRegularFields(t *testing.T) {
-	type Config struct {
-		Name    string         `toml:"name"`
-		Section customTable873 `toml:"section"`
-		Count   int            `toml:"count"`
-	}
-
-	doc := `
-name = "test"
-count = 42
-
-[section]
-foo = "bar"
-`
-
-	var cfg Config
-	err := toml.NewDecoder(bytes.NewReader([]byte(doc))).
-		EnableUnmarshalerInterface().
-		Decode(&cfg)
-
-	assert.NoError(t, err)
-	assert.Equal(t, "test", cfg.Name)
-	assert.Equal(t, 42, cfg.Count)
-	assert.Equal(t, []string{"foo"}, cfg.Section.Keys)
-	assert.Equal(t, "bar", cfg.Section.Values["foo"])
-}
-
-// Test that pointer to Unmarshaler type works
-func TestIssue873_PointerToUnmarshaler(t *testing.T) {
-	type Config struct {
-		Section *customTable873 `toml:"section"`
-	}
-
-	doc := `
-[section]
-hello = "world"
-`
-
-	var cfg Config
-	err := toml.NewDecoder(bytes.NewReader([]byte(doc))).
-		EnableUnmarshalerInterface().
-		Decode(&cfg)
-
-	assert.NoError(t, err)
-	assert.True(t, cfg.Section != nil)
-	assert.Equal(t, []string{"hello"}, cfg.Section.Keys)
-	assert.Equal(t, "world", cfg.Section.Values["hello"])
-}
-
-// Test table with sub-tables defined separately
-func TestIssue873_TableWithSubTables(t *testing.T) {
-	type Config struct {
-		Parent customTable873 `toml:"parent"`
-	}
-
-	doc := `
-[parent]
-name = "root"
-
-[parent.child]
-name = "nested"
-`
-
-	var cfg Config
-	err := toml.NewDecoder(bytes.NewReader([]byte(doc))).
-		EnableUnmarshalerInterface().
-		Decode(&cfg)
-
-	// The parent should only get the keys directly under [parent],
-	// not the [parent.child] sub-table
-	assert.NoError(t, err)
-	assert.Equal(t, []string{"name"}, cfg.Parent.Keys)
-	assert.Equal(t, "root", cfg.Parent.Values["name"])
-}
-
-// Test for issue #994 follow-up - tables defined piece-wise
-// This addresses the maintainer's comment: "It doesn't deal with tables defined piece-wise yet"
-func TestIssue994_TablesPieceWise(t *testing.T) {
-	// Test with piece-wise table definition (using [table] syntax)
-	// The customTable873 type captures key-value pairs in order,
-	// which is useful for use cases like maintaining map ordering
-	doc := `
-[section]
-first = "1"
-second = "2"
-third = "3"
-`
-
-	type Config struct {
-		Section customTable873 `toml:"section"`
-	}
-
-	var cfg Config
-	err := toml.NewDecoder(bytes.NewReader([]byte(doc))).
-		EnableUnmarshalerInterface().
-		Decode(&cfg)
-
-	assert.NoError(t, err)
-	// Verify ordering is preserved (keys are collected in document order)
-	assert.Equal(t, []string{"first", "second", "third"}, cfg.Section.Keys)
-	assert.Equal(t, "1", cfg.Section.Values["first"])
-	assert.Equal(t, "2", cfg.Section.Values["second"])
-	assert.Equal(t, "3", cfg.Section.Values["third"])
-}
-
-// Test root-level struct with tables - combines #994 fix with #873 enhancement
-func TestIssue994_RootWithTables(t *testing.T) {
-	type rootDoc struct {
-		Tables []customTable873 `toml:"tables"`
-	}
-
-	doc := `
-[[tables]]
-name = "first"
-value = "one"
-
-[[tables]]
-name = "second"
-value = "two"
-`
-
-	var d rootDoc
-	err := toml.NewDecoder(bytes.NewReader([]byte(doc))).
-		EnableUnmarshalerInterface().
-		Decode(&d)
-
-	assert.NoError(t, err)
-	assert.Equal(t, 2, len(d.Tables))
-	assert.Equal(t, "first", d.Tables[0].Values["name"])
-	assert.Equal(t, "one", d.Tables[0].Values["value"])
-	assert.Equal(t, "second", d.Tables[1].Values["name"])
-	assert.Equal(t, "two", d.Tables[1].Values["value"])
-}
-
 // Test for split tables - when the same parent table is defined in multiple places
 // This is a key requirement for issue #873: if type A implements Unmarshaler,
 // and [a.b] and [a.d] are defined with another table [x] in between,

unstable/parser.go

@@ -345,7 +345,7 @@ func (p *Parser) parseKeyval(b []byte) (reference, []byte, error) {
 	b = p.parseWhitespace(b)
 
 	if len(b) == 0 {
-		return invalidReference, nil, NewParserError(b, "expected = after a key, but the document ends there")
+		return invalidReference, nil, NewParserError(startB[:len(startB)-len(b)], "expected = after a key, but the document ends there")
 	}
 
 	b, err = expect('=', b)