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Mojo trait

UnsafeFusedView

Flags a fused trait argument whose host and device views share a byte-identical layout.

Conformance here is the legacy gate for the unsafe_fused_view rebind; it exists to keep that one host-built-closure construction compiling while kernels migrate. Prefer the supported pattern in new accelerator kernels: pass the fused trait arg straight through enqueue_function to a device kernel parameterized by XHost: DevicePassable, where the capability is reached via downcast[XHost.device_type, ...]. The canonical exemplars in GraphCompiler/test/kernels/testing_kernels.mojo follow that shape:

• TraitFusedLoadNegate (_gpu_fused_load_negate_kernel).
• TraitFusedStoreDouble (_gpu_fused_store_double_kernel).
• TraitFusedTransformBias (_gpu_fused_transform_bias_kernel).

FusedViewType is the trait's contract field -- the access-enabled view the rebind returns. It is Self.device_type on every conformer today, so the free function next door is the single place the byte-identity check lives. The day the two stop being byte-identical (e.g., NPU), the rebind becomes a real builder on the concrete type and the free function routes through it.

Implemented traits

AnyType, Copyable, Deinitable, Fused, ImplicitlyCopyable, Movable, RegisterPassable, TrivialRegisterPassable

comptime members

FusedViewType

comptime FusedViewType