Clarify pattern-matching usefulness algorithm - #65874

Merged

bors merged 17 commits into

rust-lang:masterfrom

Nadrieril:clarify-usefulness

Nov 5, 2019

Commits on Oct 27, 2019

Run `rustfmt`
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a5de5a6
tidy
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af35934
Remove mention of old slice pattern syntax
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7986599
Clarify and fix the explanation of the algorithm
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2665b64

Commits on Nov 1, 2019

Abstract out pattern stacks to make the code more legible
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403d6bd
Factor out some pattern-stack related functions
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23ca38e
Remove some redundancy
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5e734be
Remove duplicate logic in compute_missing_constructors
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0c02c19
Extract constructor application as a Constructor method
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b454581
Refactor "wild constructor" construction
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175976e
Clarify some variable names
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57a656a
`specialize` conceptually operates on a single pattern
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d663c27
Wording
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cc4583d
Define a MissingConstructors struct for cleanliness
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92101b7
Factor out constructor subtraction
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b7fa9f1
Factor out witness reconstruction
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8956c1e
Clarifications suggested by varkor
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a96d700