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Prevent accidental too-long borrows by ensuring only encapsulated
locking.
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It's useful to see the biggest variants first.
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The field init shorthand syntax was stabilized in 1.17.0 (aebd94f); we
are now free to use it in the compiler.
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This was done by sorting the fields by increasing offset; as a consequence, the order of -Z print-type-sizes matches memory order not source order.
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Biggest change: Revised print-type-sizes output to include breakdown
of layout.
Includes info about field sizes (and alignment + padding when padding
is injected; the injected padding is derived from the offsets computed
by layout module).
Output format is illustrated in commit that has the ui tests.
Note: there exists (at least) one case of variant w/o name: empty
enums. Namely, empty enums use anonymous univariant repr. So for such
cases, print the number of the variant instead of the name.
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Also, eddyb suggested of reading from `layout_cache` post-trans.
(For casual readers: the compiler source often uses the word "cache"
for tables that are in fact not periodically purged, and thus are
useful as the basis for data like this.)
Some types that were previously not printed are now included in the
output. (See e.g. the tests `print_type_sizes/generics.rs` and
`print_type_sizes/variants.rs`)
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Other review feedback:
switch to an exhaustive match when filtering in just structural types.
switch to hashset for layout info and move sort into print method.
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Driveby change: Factored session::code_stats into its own module
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incorporate njn feedback re output formatting.
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