error: expected type, found `{` --> $DIR/macro-fail.rs:28:27 | LL | fn make_marker() -> impl Marker { | ---------------------- | | | this macro call doesn't expand to a type | in this macro invocation ... LL | ($rusty: ident) => {{ let $rusty = 3; *&$rusty }} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected type | = note: this error originates in the macro `gimme_a_const` (in Nightly builds, run with -Z macro-backtrace for more info) error: expected type, found `{` --> $DIR/macro-fail.rs:28:27 | LL | Example:: | ---------------------- | | | this macro call doesn't expand to a type | in this macro invocation ... LL | ($rusty: ident) => {{ let $rusty = 3; *&$rusty }} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected type | = note: this error originates in the macro `gimme_a_const` (in Nightly builds, run with -Z macro-backtrace for more info) error: expected type, found `{` --> $DIR/macro-fail.rs:4:10 | LL | () => {{ | __________^ LL | | LL | | const X: usize = 1337; LL | | X LL | | }} | |___^ expected type ... LL | let _fail = Example::; | ----------------- | | | this macro call doesn't expand to a type | in this macro invocation | = note: this error originates in the macro `external_macro` (in Nightly builds, run with -Z macro-backtrace for more info) error: unexpected end of macro invocation --> $DIR/macro-fail.rs:37:25 | LL | macro_rules! gimme_a_const { | -------------------------- when calling this macro ... LL | let _fail = Example::; | ^^^^^^^^^^^^^^^^ missing tokens in macro arguments | note: while trying to match meta-variable `$rusty:ident` --> $DIR/macro-fail.rs:28:8 | LL | ($rusty: ident) => {{ let $rusty = 3; *&$rusty }} | ^^^^^^^^^^^^^ error[E0747]: type provided when a constant was expected --> $DIR/macro-fail.rs:14:33 | LL | fn make_marker() -> impl Marker { | ^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to 5 previous errors For more information about this error, try `rustc --explain E0747`.