dbl

hex-literal: add support for colon-delimited literals #1947

Job	Run time
build (1.85.0, wasm32-unknown-unknown)	17s
test (1.85.0)	17s
build (stable, thumbv7em-none-eabi)	25s
build (1.85.0, thumbv7em-none-eabi)	19s
test (stable)	13s
build (stable, wasm32-unknown-unknown)	19s
minimal-versions / minimal-versions	31s
	2m 21s

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