-Z dump-mono-stats compiler flag generates a file with a list of the monomorphized items in the current crate.
It is useful for investigating compile times.
It accepts an optional directory where the file will be located. If no directory is specified, the file will be placed in the current directory.
-Z dump-mono-stats-format and
-Z print-mono-items. Unlike
dump-mono-stats aggregates monomorphized items by definition and includes a size estimate of how
large the item is when codegened.
See https://rustc-dev-guide.rust-lang.org/backend/monomorph.html for an overview of monomorphized items.