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Fix for recursive impl trait type error #1

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Fix for recursive impl trait type error #1

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8 changes: 6 additions & 2 deletions src/metadata/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -153,7 +153,10 @@ impl MetaValue {
MetaValue::Str(ref s) => { yield s; },
MetaValue::Seq(ref mvs) => {
for mv in mvs {
for i in Box::new(mv.iter_over(mis)) {
// We cannot hold a value of our return type across a yield as it makes the
// generator type recursive. Erasing the type avoids this issue.
let values: Box<dyn Iterator<Item = &String>> = Box::new(mv.iter_over(mis));
for i in values {
yield i;
}
}
Expand All @@ -172,7 +175,8 @@ impl MetaValue {

match mis {
MappingIterScheme::Vals | MappingIterScheme::Both => {
for s in Box::new(mv.iter_over(mis)) {
let values: Box<dyn Iterator<Item = &String>> = Box::new(mv.iter_over(mis));
for s in values {
yield s;
}
},
Expand Down