| #include <metal_stdlib> | 
 |  | 
 | using namespace metal; | 
 |  | 
 | template<typename T, size_t N> | 
 | struct tint_array { | 
 |     const constant T& operator[](size_t i) const constant { return elements[i]; } | 
 |     device T& operator[](size_t i) device { return elements[i]; } | 
 |     const device T& operator[](size_t i) const device { return elements[i]; } | 
 |     thread T& operator[](size_t i) thread { return elements[i]; } | 
 |     const thread T& operator[](size_t i) const thread { return elements[i]; } | 
 |     threadgroup T& operator[](size_t i) threadgroup { return elements[i]; } | 
 |     const threadgroup T& operator[](size_t i) const threadgroup { return elements[i]; } | 
 |     T elements[N]; | 
 | }; | 
 |  | 
 | #define TINT_ISOLATE_UB(VOLATILE_NAME) \ | 
 |   volatile bool VOLATILE_NAME = true; \ | 
 |   if (VOLATILE_NAME) | 
 |  | 
 | struct tint_private_vars_struct { | 
 |   uint i; | 
 | }; | 
 |  | 
 | struct S { | 
 |   int a; | 
 |   float4 b; | 
 |   float2x2 c; | 
 | }; | 
 |  | 
 | int idx1(thread tint_private_vars_struct* const tint_private_vars) { | 
 |   (*(tint_private_vars)).i = ((*(tint_private_vars)).i + 1u); | 
 |   return 1; | 
 | } | 
 |  | 
 | int idx2(thread tint_private_vars_struct* const tint_private_vars) { | 
 |   (*(tint_private_vars)).i = ((*(tint_private_vars)).i + 2u); | 
 |   return 1; | 
 | } | 
 |  | 
 | int idx3(thread tint_private_vars_struct* const tint_private_vars) { | 
 |   (*(tint_private_vars)).i = ((*(tint_private_vars)).i + 3u); | 
 |   return 1; | 
 | } | 
 |  | 
 | void foo(thread tint_private_vars_struct* const tint_private_vars) { | 
 |   tint_array<float, 4> a = tint_array<float, 4>{}; | 
 |   { | 
 |     int const tint_symbol_2 = idx1(tint_private_vars); | 
 |     int const tint_symbol_save = tint_symbol_2; | 
 |     a[tint_symbol_save] = (a[tint_symbol_save] * 2.0f); | 
 |     TINT_ISOLATE_UB(tint_volatile_true) while(true) { | 
 |       int const tint_symbol_3 = idx2(tint_private_vars); | 
 |       if (!((a[tint_symbol_3] < 10.0f))) { | 
 |         break; | 
 |       } | 
 |       { | 
 |       } | 
 |       { | 
 |         int const tint_symbol_4 = idx3(tint_private_vars); | 
 |         int const tint_symbol_1_save = tint_symbol_4; | 
 |         a[tint_symbol_1_save] = (a[tint_symbol_1_save] + 1.0f); | 
 |       } | 
 |     } | 
 |   } | 
 | } | 
 |  |