It _looks_ like the base-toolchain builds are unhappy with some code in other places. I guess I'll have to fall back to the clunkier syntax.
Bug 1193437 Comment 19 Edit History
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It _looks_ like the base-toolchain builds are unhappy with some code in other places if they use gcc 8, although gcc 8 seems to be ok with the syntax I'm using here. I guess I'll have to fall back to the clunkier syntax.