diff --git a/docs/bootstrap-inventory.md b/docs/bootstrap-inventory.md
index 66ba038e..a1a0f920 100644
--- a/docs/bootstrap-inventory.md
+++ b/docs/bootstrap-inventory.md
@@ -8,9 +8,9 @@ Regenerate: `php script/bootstrap-inventory.php`
 
 | Metric | Count |
 |--------|------:|
-| PHP files on vm.php path | 195 |
+| PHP files on vm.php path | 196 |
 | Source constructs flagged (blockers) | 10 |
-| Source constructs flagged (warnings) | 518 |
+| Source constructs flagged (warnings) | 523 |
 
 ## Compiler CFG gaps (`lib/Compiler.php`)
 
@@ -197,9 +197,10 @@ These `LogicException` messages indicate CFG ops or expressions not yet lowered:
 | `lib/JIT/SuperglobalInit.php` | 0 | 3 |
 | `lib/JIT/ValueEchoHelper.php` | 0 | 1 |
 | `lib/JIT/Variable.php` | 0 | 18 |
+| `lib/Lint/IncrementDetector.php` | 0 | 4 |
 | `lib/Lint/Issue.php` | 0 | 2 |
 | `lib/Lint/LintCompiler.php` | 0 | 6 |
-| `lib/Lint/Linter.php` | 0 | 4 |
+| `lib/Lint/Linter.php` | 0 | 5 |
 | `lib/Lint/UnsupportedRegistry.php` | 0 | 1 |
 | `lib/Module.php` | 0 | 1 |
 | `lib/ModuleAbstract.php` | 0 | 1 |
@@ -1318,6 +1319,14 @@ These `LogicException` messages indicate CFG ops or expressions not yet lowered:
 - new Variable (line 473)
 - 15 class method(s) — PHPCfg Op\Stmt\ClassMethod not lowered in Compiler
 
+### `lib/Lint/IncrementDetector.php`
+
+**Warnings** (review for bootstrap subset):
+- new ParserFactory (line 34)
+- new NodeTraverser (line 56)
+- new Issue (line 63)
+- 2 class method(s) — PHPCfg Op\Stmt\ClassMethod not lowered in Compiler
+
 ### `lib/Lint/Issue.php`
 
 **Warnings** (review for bootstrap subset):
@@ -1338,8 +1347,9 @@ These `LogicException` messages indicate CFG ops or expressions not yet lowered:
 
 **Warnings** (review for bootstrap subset):
 - new Runtime (line 24)
-- new State (line 83)
-- new LintCompiler (line 98)
+- new IncrementDetector (line 44)
+- new State (line 86)
+- new LintCompiler (line 101)
 - 9 class method(s) — PHPCfg Op\Stmt\ClassMethod not lowered in Compiler
 
 ### `lib/Lint/UnsupportedRegistry.php`
diff --git a/docs/unsupported-syntax.md b/docs/unsupported-syntax.md
index 7349f48a..b2e28723 100644
--- a/docs/unsupported-syntax.md
+++ b/docs/unsupported-syntax.md
@@ -27,6 +27,7 @@ Exit code `0` when the entry (and best-effort `include`/`require` targets with s
 | `Expr_Yield`, `Expr_YieldFrom` | [#167](https://github.com/PurHur/php-compiler/issues/167) |
 | `Expr_Closure` | [#72](https://github.com/PurHur/php-compiler/issues/72) |
 | `Expr_ArrowFunction` | [#142](https://github.com/PurHur/php-compiler/issues/142) |
+| `Expr_PreInc`, `Expr_PostInc`, `Expr_PreDec`, `Expr_PostDec` (`++`/`--`) | [#137](https://github.com/PurHur/php-compiler/issues/137) |
 | `Expr_New` (non-trivial) | [#136](https://github.com/PurHur/php-compiler/issues/136) |
 | Named arguments, traits, enums | [#168](https://github.com/PurHur/php-compiler/issues/168), [#169](https://github.com/PurHur/php-compiler/issues/169) |
 
diff --git a/lib/Lint/IncrementDetector.php b/lib/Lint/IncrementDetector.php
new file mode 100644
index 00000000..965263ae
--- /dev/null
+++ b/lib/Lint/IncrementDetector.php
@@ -0,0 +1,74 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PHPCompiler\Lint;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\PostDec;
+use PhpParser\Node\Expr\PostInc;
+use PhpParser\Node\Expr\PreDec;
+use PhpParser\Node\Expr\PreInc;
+use PhpParser\NodeTraverser;
+use PhpParser\NodeVisitorAbstract;
+use PhpParser\ParserFactory;
+
+/**
+ * php-cfg lowers ++/-- to assign+binary ops; lint still flags AST nodes until #137.
+ */
+final class IncrementDetector
+{
+    /** @var array<class-string<Node>, string> */
+    public const NODE_TO_KIND = [
+        PreInc::class => 'Expr_PreInc',
+        PostInc::class => 'Expr_PostInc',
+        PreDec::class => 'Expr_PreDec',
+        PostDec::class => 'Expr_PostDec',
+    ];
+
+    /**
+     * @return list<Issue>
+     */
+    public function detect(string $code, string $filename): array
+    {
+        $parser = (new ParserFactory())->create(ParserFactory::PREFER_PHP7);
+        try {
+            $ast = $parser->parse($code);
+        } catch (\PhpParser\Error $e) {
+            return [];
+        }
+        if (!is_array($ast)) {
+            return [];
+        }
+
+        $visitor = new class extends NodeVisitorAbstract {
+            /** @var list<array{int, string}> */
+            public array $hits = [];
+
+            public function enterNode(Node $node)
+            {
+                if (isset(IncrementDetector::NODE_TO_KIND[get_class($node)])) {
+                    $this->hits[] = [$node->getStartLine(), IncrementDetector::NODE_TO_KIND[get_class($node)]];
+                }
+            }
+        };
+
+        $traverser = new NodeTraverser();
+        $traverser->addVisitor($visitor);
+        $traverser->traverse($ast);
+
+        $issues = [];
+        foreach ($visitor->hits as [$line, $kind]) {
+            $tracking = UnsupportedRegistry::trackingIssueForKind($kind);
+            $issues[] = new Issue(
+                $filename,
+                $line,
+                $kind,
+                "Unsupported expression: {$kind}",
+                $tracking
+            );
+        }
+
+        return $issues;
+    }
+}
diff --git a/lib/Lint/Linter.php b/lib/Lint/Linter.php
index 5557d4e1..417da85a 100644
--- a/lib/Lint/Linter.php
+++ b/lib/Lint/Linter.php
@@ -41,8 +41,11 @@ public function lintFile(string $filename): array
      */
     public function lintSource(string $code, string $filename): array
     {
+        $issues = (new IncrementDetector())->detect($code, $filename);
         $script = $this->parseForLint($code, $filename);
-        $issues = $this->lintScript($script);
+        foreach ($this->lintScript($script) as $issue) {
+            $issues[] = $issue;
+        }
         $queue = [$filename => $script];
         $seenFiles = [$filename => true];
 
diff --git a/lib/Lint/UnsupportedRegistry.php b/lib/Lint/UnsupportedRegistry.php
index 39f51499..2f5a02d4 100644
--- a/lib/Lint/UnsupportedRegistry.php
+++ b/lib/Lint/UnsupportedRegistry.php
@@ -44,6 +44,10 @@ final class UnsupportedRegistry
         'Expr_Closure' => 72,
         'Stmt_Trait' => 168,
         'Expr_NamedArgument' => 168,
+        'Expr_PreInc' => 137,
+        'Expr_PostInc' => 137,
+        'Expr_PreDec' => 137,
+        'Expr_PostDec' => 137,
     ];
 
     public static function trackingIssueForKind(string $kind): ?int
diff --git a/test/unit/LintTest.php b/test/unit/LintTest.php
index 8774395a..80588996 100644
--- a/test/unit/LintTest.php
+++ b/test/unit/LintTest.php
@@ -52,6 +52,22 @@ public function testLintYieldReportsIssue167(): void
         $this->assertStringNotContainsString('#114', $exit['stdout']);
     }
 
+    public function testLintPreIncReportsIssue137(): void
+    {
+        $exit = $this->runLint(['-r', '++$i;']);
+        $this->assertSame(1, $exit['code']);
+        $this->assertStringContainsString('#137', $exit['stdout']);
+        $this->assertStringContainsString('Expr_PreInc', $exit['stdout']);
+    }
+
+    public function testLintPostIncReportsIssue137(): void
+    {
+        $exit = $this->runLint(['-r', '$i++;']);
+        $this->assertSame(1, $exit['code']);
+        $this->assertStringContainsString('#137', $exit['stdout']);
+        $this->assertStringContainsString('Expr_PostInc', $exit['stdout']);
+    }
+
     public function testLintCleanScriptExitsZero(): void
     {
         $code = '<?php echo "ok";';
diff --git a/test/unit/UnsupportedRegistryTest.php b/test/unit/UnsupportedRegistryTest.php
index 27c8b6c5..9224a33a 100644
--- a/test/unit/UnsupportedRegistryTest.php
+++ b/test/unit/UnsupportedRegistryTest.php
@@ -29,6 +29,10 @@ public static function kindToIssueProvider(): array
             'yield from' => ['Expr_YieldFrom', 167],
             'closure' => ['Expr_Closure', 72],
             'arrow function' => ['Expr_ArrowFunction', 142],
+            'pre inc' => ['Expr_PreInc', 137],
+            'post inc' => ['Expr_PostInc', 137],
+            'pre dec' => ['Expr_PreDec', 137],
+            'post dec' => ['Expr_PostDec', 137],
         ];
     }