Diagnostic regression for struct-like enum variant constructors from private modules when missing fields

[RadicalZephyr]

Code

I tried this code:

mod inner {
    pub enum MyEnum {
        EscapeSequence { sequence: String, bad: bool },
    }
}

fn main() {
    let x = inner::MyEnum::EscapeSequence {
        sequence: String::from(""),
    };
}

Playground

I expected to see this happen:

The compiler used to correctly suggest that a field was missing from the enum constructor:

error[E0063]: missing field `bad` in initializer of `inner::MyEnum`
 --> src/main.rs:8:13
  |
8 |     let x = inner::MyEnum::EscapeSequence {
  |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `bad`

Instead, this happened:

Now the compiler erroneously reports:

error: cannot construct `MyEnum` with struct literal syntax due to inaccessible fields
 --> src/main.rs:8:13
  |
8 |     let x = inner::MyEnum::EscapeSequence {
  |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Version it worked on

It most recently worked on: Rust 1.47

Version with regression

rustc --version --verbose:

rustc 1.48.0 (7eac88abb 2020-11-16)
binary: rustc
commit-hash: 7eac88abb2e57e752f3302f02be5f3ce3d7adfb4
commit-date: 2020-11-16
host: x86_64-unknown-linux-gnu
release: 1.48.0
LLVM version: 11.0

[camelid]

Duplicate of #79593. Will be fixed in 1.50.