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update comment to more accurately describe the limitations

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This commit is contained in:
Niko Matsakis 2018-08-07 10:07:35 -04:00
parent fb1702f301
commit db7a07cfc6
1 changed files with 5 additions and 3 deletions
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8
src/librustc_mir/borrow_check/nll/constraints/mod.rs
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@ -37,9 +37,11 @@ impl ConstraintSet {
}
/// Constructs a graph from the constraint set; the graph makes it
/// easy to find the constraints affecting a particular region
/// (you should not mutate the set once this graph is
/// constructed).
/// easy to find the constraints affecting a particular region.
///
/// NB: This graph contains a "frozen" view of the current
/// constraints. any new constraints added to the `ConstraintSet`
/// after the graph is built will not be present in the graph.
crate fn graph(&self, num_region_vars: usize) -> graph::ConstraintGraph {
graph::ConstraintGraph::new(self, num_region_vars)
}