54b6292855
Fix --extern library finding errors
- `crate_name` is not specified/passed to `metadata_crate_location_unknown_type`
c493bae0d8/compiler/rustc_error_messages/locales/en-US/metadata.ftl (L274-L275)
- `metadata_lib_filename_form` is missing `$`
- Add additional check to ensure that library is file
Testing
1. Create file `a.rs`
```rust
extern crate t;
fn main() {}
```
1. Create empty file `x`
1. Create empty directory `y`
1. Run
```sh
$ rustc -o a a.rs --extern t=x
$ rustc -o a a.rs --extern t=y
```
Both currently panic with stable.