error[E0539]: malformed `cfg_attr` attribute input
  --> $DIR/cfg_attr-attr-syntax-validation.rs:1:1
   |
LL | #[cfg_attr]
   | ^^^^^^^^^^^
   | |
   | expected this to be a list
   | help: must be of the form: `#[cfg_attr(predicate, attr1, attr2, ...)]`
   |
   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg_attr-attribute>

error[E0539]: malformed `cfg_attr` attribute input
  --> $DIR/cfg_attr-attr-syntax-validation.rs:5:1
   |
LL | #[cfg_attr = 10]
   | ^^^^^^^^^^^^^^^^
   | |
   | expected this to be a list
   | help: must be of the form: `#[cfg_attr(predicate, attr1, attr2, ...)]`
   |
   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg_attr-attribute>

error[E0539]: malformed `cfg_attr` attribute input
  --> $DIR/cfg_attr-attr-syntax-validation.rs:9:1
   |
LL | #[cfg_attr()]
   | ^^^^^^^^^^--^
   | |         |
   | |         expected at least 1 argument here
   | help: must be of the form: `#[cfg_attr(predicate, attr1, attr2, ...)]`
   |
   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg_attr-attribute>

error[E0539]: malformed `cfg_attr` attribute input
  --> $DIR/cfg_attr-attr-syntax-validation.rs:13:1
   |
LL | #[cfg_attr("str")]
   | ^^^^^^^^^^^-----^^
   | |          |
   | |          expected a valid identifier here
   | help: must be of the form: `#[cfg_attr(predicate, attr1, attr2, ...)]`
   |
   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg_attr-attribute>

error[E0539]: malformed `cfg_attr` attribute input
  --> $DIR/cfg_attr-attr-syntax-validation.rs:16:1
   |
LL | #[cfg_attr(a::b)]
   | ^^^^^^^^^^^----^^
   | |          |
   | |          expected a valid identifier here
   | help: must be of the form: `#[cfg_attr(predicate, attr1, attr2, ...)]`
   |
   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg_attr-attribute>

error[E0537]: invalid predicate `a`
  --> $DIR/cfg_attr-attr-syntax-validation.rs:19:12
   |
LL | #[cfg_attr(a())]
   |            ^^^

error[E0539]: malformed `cfg_attr` attribute input
  --> $DIR/cfg_attr-attr-syntax-validation.rs:22:1
   |
LL | #[cfg_attr(a = 10)]
   | ^^^^^^^^^^^^^^^--^^
   | |              |
   | |              expected a string literal here
   | help: must be of the form: `#[cfg_attr(predicate, attr1, attr2, ...)]`
   |
   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg_attr-attribute>

error[E0539]: malformed `cfg_attr` attribute input
  --> $DIR/cfg_attr-attr-syntax-validation.rs:25:1
   |
LL | #[cfg_attr(a = b"hi")]
   | ^^^^^^^^^^^^^^^-^^^^^^
   |                |
   |                help: consider removing the prefix
   |
   = note: expected a normal string literal, not a byte string literal

error: expected `,`, found end of `cfg_attr` input
  --> $DIR/cfg_attr-attr-syntax-validation.rs:38:16
   |
LL | #[cfg_attr(true)]
   | ---------------^-
   | |              |
   | |              expected `,`
   | help: must be of the form: `#[cfg_attr(predicate, attr1, attr2, ...)]`
   |
   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg_attr-attribute>

error: expected a literal (`1u8`, `1.0f32`, `"string"`, etc.) here, found `expr` metavariable
  --> $DIR/cfg_attr-attr-syntax-validation.rs:30:30
   |
LL |         #[cfg_attr(feature = $expr)]
   |         ---------------------^^^^^-- help: must be of the form: `#[cfg_attr(predicate, attr1, attr2, ...)]`
...
LL | generate_s10!(concat!("nonexistent"));
   | ------------------------------------- in this macro invocation
   |
   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg_attr-attribute>
   = note: this error originates in the macro `generate_s10` (in Nightly builds, run with -Z macro-backtrace for more info)

error: cannot find attribute `unknown_attribute` in this scope
  --> $DIR/cfg_attr-attr-syntax-validation.rs:41:18
   |
LL | #[cfg_attr(true, unknown_attribute)]
   |                  ^^^^^^^^^^^^^^^^^

error[E0539]: malformed `link_section` attribute input
  --> $DIR/cfg_attr-attr-syntax-validation.rs:44:18
   |
LL | #[cfg_attr(true, link_section)]
   |                  ^^^^^^^^^^^^ help: must be of the form: `#[link_section = "name"]`
   |
   = note: for more information, visit <https://doc.rust-lang.org/reference/abi.html#the-link_section-attribute>

error[E0805]: malformed `inline` attribute input
  --> $DIR/cfg_attr-attr-syntax-validation.rs:49:18
   |
LL | #[cfg_attr(true, inline())]
   |                  ^^^^^^--
   |                        |
   |                        expected a single argument here
   |
   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/codegen.html#the-inline-attribute>
help: try changing it to one of the following valid forms of the attribute
   |
LL - #[cfg_attr(true, inline())]
LL + #[cfg_attr(true, #[inline(always)])]
   |
LL - #[cfg_attr(true, inline())]
LL + #[cfg_attr(true, #[inline(never)])]
   |
LL - #[cfg_attr(true, inline())]
LL + #[cfg_attr(true, #[inline])]
   |

warning: `#[link_section]` attribute cannot be used on structs
  --> $DIR/cfg_attr-attr-syntax-validation.rs:44:18
   |
LL | #[cfg_attr(true, link_section)]
   |                  ^^^^^^^^^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = help: `#[link_section]` can be applied to functions and statics
   = note: requested on the command line with `-W unused-attributes`

error: aborting due to 13 previous errors; 1 warning emitted

Some errors have detailed explanations: E0537, E0539, E0805.
For more information about an error, try `rustc --explain E0537`.