Commits on Jul 30, 2024

1. fix C codegen regression with closures …

   Summary
   -------
   
   Fix explicit or implicit creation of a closure leading to the C
   compiler errors when using strict(er) C compilers.
   
   Details
   -------
   
   * when lowering the closure types, use a `tkProc` type with `ccClosure`
     calling convention
   * using a `ccNimCall` type with an additional `void` parameter meant
     that `cgen` placed the result type (in case of RVO) *after* the
     environment type, which is incorrect and doesn't match the signature
     of closure procedures
   * C compilers that require proper typing for pointer assignments
     rightfully reported an error in this case

   

   zerbina committed Jul 30, 2024
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