fix: Prevent tgpu.unroll from introducing possible side effects

packages/typegpu/src/tgsl/wgslGenerator.ts

@@ -1861,7 +1861,7 @@ ${this.ctx.pre}else ${alternate}`,
             : value instanceof ArrayExpression
               ? value.elements
               : Array.from({ length: knownEnd.value as number }, (_, i) =>
-                  forOfUtils.getElementSnippet(iterableSnippet, snip(i, u32, 'constant')),
+                  forOfUtils.getElementSnippet(iterableSnippet, snip(i, u32, 'constant', false)),
                 );
 
           if (elements.length === 0) {

packages/typegpu/tests/unroll.test.ts

@@ -985,4 +985,18 @@ describe('tgpu.unroll', () => {
       }"
     `);
   });
+
+  it('does not introduce possibleSideEffects', () => {
+    const arr = tgpu.accessor(d.arrayOf(d.f32, 3), [1, 2, 3]);
+
+    const f = () => {
+      'use gpu';
+      for (const value of tgpu.unroll(arr.$)) {
+        const _known = std.isKnownAtComptime(value);
+      }
+    };
+
+    const code = tgpu.resolve([f]);
+    expect(code).toMatchNTimes(/true/g, 3);
+  });
 });