Change for desugaring & make refutable pattern errors more precise
#14444
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Change
fordesugaring & make refutable pattern errors more preciseThis changes for to desugar to the
let-based pattern match as described in #14390, and adjusts the compiler to use this information for error messages that even mention that it's in aforloop.Also, it makes the compiler record the exact positions of refutable parts of a pattern, to point to exactly them in error messages.