ctor 0.12.0

__attribute__((constructor)) for Rust
Documentation 
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error: Invalid ctor item. Expected a function with no args, return value, or type parameters or a static variable.
       Valid forms are:
       - [pub] [unsafe] [extern $abi] fn $name() { ... }
       - static $name : $ty = [unsafe] { ... };
 --> tests/errors/ctor_bad_shape.rs:3:1
  |
3 | #[ctor]
  | ^^^^^^^
  |
  = note: this error originates in the macro `$crate::__ctor_parse_impl` which comes from the expansion of the attribute macro `ctor` (in Nightly builds, run with -Z macro-backtrace for more info)

error: Invalid ctor item. Expected a function with no args, return value, or type parameters or a static variable.
       Valid forms are:
       - [pub] [unsafe] [extern $abi] fn $name() { ... }
       - static $name : $ty = [unsafe] { ... };
 --> tests/errors/ctor_bad_shape.rs:8:1
  |
8 | #[ctor]
  | ^^^^^^^
  |
  = note: this error originates in the macro `$crate::__ctor_parse_impl` which comes from the expansion of the attribute macro `ctor` (in Nightly builds, run with -Z macro-backtrace for more info)

error: Invalid ctor item. Expected a function with no args, return value, or type parameters or a static variable.
       Valid forms are:
       - [pub] [unsafe] [extern $abi] fn $name() { ... }
       - static $name : $ty = [unsafe] { ... };
  --> tests/errors/ctor_bad_shape.rs:15:5
   |
15 |     #[ctor]
   |     ^^^^^^^
   |
   = note: this error originates in the macro `$crate::__ctor_parse_impl` which comes from the expansion of the attribute macro `ctor` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0401]: can't use generic parameters from outer item
  --> tests/errors/ctor_bad_shape.rs:28:13
   |
24 | impl<T: Default> FooGeneric<T> {
   |      - type parameter from outer item
25 |     #[ctor]
   |     ------- generic parameter used in this inner function
...
28 |         _ = T::default();
   |             ^ use of generic parameter from outer item
   |
   = note: nested items are independent from their parent item for everything except for privacy and name resolution
help: try introducing a local generic parameter here
  --> src/parse.rs
   |
   |             $($unsafe)* $( extern $abi )? fn __ctor_private_inner<T>() {
   |                                                                  +++