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`Fallback::begin` returns before the fallback runs when `WGPU_BACKEND`
is set, logging that wgpu picks the backend. So the line below it is
reached only when the variable is *not* set -- and it said
"(WGPU_BACKEND overrides)", which reads in a log as though the user's
environment had chosen the backend when nothing had.
before: graphics: DirectX 12 (WGPU_BACKEND overrides)
after: graphics: DirectX 12 (first choice; set WGPU_BACKEND to choose another)
The report quotes that line as evidence of which backend a start used,
which is exactly the wrong conclusion to be led to.
Part of #1343.