fix ICE in iter

nikomatsakis · nikomatsakis · commit cd507e99830c · 2018-07-16T11:20:30.000-04:00
diff --git a/src/librustc_data_structures/bitvec.rs b/src/librustc_data_structures/bitvec.rs
@@ -358,7 +358,7 @@ impl<R: Idx, C: Idx> SparseBitMatrix<R, C> {
     /// Iterates through all the columns set to true in a given row of
     /// the matrix.
     pub fn iter<'a>(&'a self, row: R) -> impl Iterator<Item = C> + 'a {
-        self.vector[row].iter()
+        self.vector.get(row).into_iter().flat_map(|r| r.iter())
     }
 
     /// Iterates through each row and the accompanying bit set.

Original file line number	Diff line number	Diff line change
`@@ -358,7 +358,7 @@ impl<R: Idx, C: Idx> SparseBitMatrix<R, C> {`
`358`	`358`	`/// Iterates through all the columns set to true in a given row of`
`359`	`359`	`/// the matrix.`
`360`	`360`	`pub fn iter<'a>(&'a self, row: R) -> impl Iterator<Item = C> + 'a {`
`361`		`- self.vector[row].iter()`
	`361`	`+ self.vector.get(row).into_iter().flat_map(\|r\| r.iter())`
`362`	`362`	`}`
`363`	`363`
`364`	`364`	`/// Iterates through each row and the accompanying bit set.`