correct spans in parem_env to deduplicate errors#102502

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SparrowLii wants to merge 3 commits intorust-lang:masterfrom

SparrowLii:normalize_param_env

Commits on Sep 28, 2022

avoid collecting `Vec` multiple times when normalize `param_env`
SparrowLii
committed

Commits on Sep 30, 2022

correct spans in `parem_env` to deduplicate errors
SparrowLii
committed

Commits on Oct 3, 2022

rename variable
SparrowLii
committed