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Prior to this, the code there had a few issues:
- Default implementations inconsistently either had the prefix `noop_` or
not.
- Some default methods where implemented in terms of a public noop function
for user code to call, others where implemented directly on the trait
and did not allow users of the trait to reuse the code.
- Some of the default implementations where private, and thus not reusable
for other implementors.
- There where some bugs where default implementations called other default
implementations directly, rather than to the underlying Folder, with the
result of some AST nodes never being visited even if the user implemented that
method. (For example, the current Folder never folded struct fields)
This commit solves this situation somewhat radically by making _all_
`fold_...` functions in the module into Folder methods, and implementing
them all in terms of public `noop_...` functions for other implementors to
call out to.
Some public functions had to be renamed to fit the new system, so this is a
breaking change.
[breaking-change]
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Per @pnkfelix 's suggestion, using a trait to make these
field accesses more readable (and vastly more similar
to the original code.
oops fix new ast_map fix
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Use one or more of the following `-Z` flag options to tell the
graphviz renderer to include the corresponding dataflow sets (after
the iterative constraint propagation reaches a fixed-point solution):
* `-Z flowgraph-print-loans` : loans computed via middle::borrowck
* `-Z flowgraph-print-moves` : moves computed via middle::borrowck::move_data
* `-Z flowgraph-print-assigns` : assignments, via middle::borrowck::move_data
* `-Z flowgraph-print-all` : all of the available sets are included.
Fix #15016.
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This also adds a module, `syntax::ast_map::blocks`, that captures a
common abstraction shared amongst code blocks and procedure-like
things. As part of this, moved `ast_map.rs` to subdir
`ast_map/mod.rs`, to follow our directory layout conventions.
(incorporated review feedback from huon, acrichto.)
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