| error: attribute value must be a literal | 
 |   --> $DIR/key-value-expansion.rs:27:14 | 
 |    | | 
 | LL |         bug!("bug" + stringify!(found)); | 
 |    |              ^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | ... | 
 | LL | bug!(); | 
 |    | ------ in this macro invocation | 
 |    | | 
 |    = note: this error originates in the macro `bug` (in Nightly builds, run with -Z macro-backtrace for more info) | 
 |  | 
 | error: attribute value must be a literal | 
 |   --> $DIR/key-value-expansion.rs:48:23 | 
 |    | | 
 | LL |         doc_comment! {format!("{coor}", coor = stringify!($t1)).as_str()} | 
 |    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | ... | 
 | LL | some_macro!(u8); | 
 |    | --------------- in this macro invocation | 
 |    | | 
 |    = note: this error originates in the macro `some_macro` (in Nightly builds, run with -Z macro-backtrace for more info) | 
 |  | 
 | error: attribute value must be a literal | 
 |   --> $DIR/key-value-expansion.rs:21:6 | 
 |    | | 
 | LL | bug!((column!())); | 
 |    |      ^^^^^^^^^^^ | 
 |  | 
 | error: aborting due to 3 previous errors | 
 |  |