1 error[E0124]: field `a` is already declared
2 --> $DIR/fields-definition.rs:14:13
5 | ----- `a` first declared here
7 | ^^^^^^ field already declared
10 | ---------- in this macro invocation
12 = note: this error originates in the macro `legacy` (in Nightly builds, run with -Z macro-backtrace for more info)
14 error: aborting due to previous error
16 For more information about this error, try `rustc --explain E0124`.