Fix invalid RestPat for convert_tuple_struct_to_named_struct #20880
+56
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```rust
struct X$0(i8, i16, i32, i64);
fn foo(X(a, .., d): X) {}
```
**Before this PR**:
```rust
struct X { field1: i8, field2: i16, field3: i32, field4: i64 }
fn foo(X { field1: a, field2: .., field3: d }: X) {}
```
**After this PR**:
```rust
struct X { field1: i8, field2: i16, field3: i32, field4: i64 }
fn foo(X { field1: a, field4: d, .. }: X) {}
```
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Oct 21, 2025
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Before this PR:
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