Enum comparisons receive superflous and verbose casts

[TheDan64]

typedef enum {
    FIND, ENTER
} ACTION;

int main(void) {
    ACTION action = FIND;
    if (action == FIND) {
        return 2;
    }

    return 1;
}

becomes

pub type ACTION = libc::c_uint;
pub const ENTER: ACTION = 1;
pub const FIND: ACTION = 0;
unsafe fn main_0() -> libc::c_int {
    let mut action: ACTION = FIND;
    if action as libc::c_uint == FIND as libc::c_int as libc::c_uint {
        return 2i32
    }
    return 1i32;
}

This does seem to be true to the AST (but is unnecessarily verbose):

  `-CompoundStmt 0x5293368 <col:16, line:12:1>
    |-DeclStmt 0x52931d0 <line:6:5, col:25>
    | `-VarDecl 0x5293130 <col:5, col:21> col:12 used action 'ACTION':'ACTION' cinit
    |   `-ImplicitCastExpr 0x52931b8 <col:21> 'ACTION':'ACTION' <IntegralCast>
    |     `-DeclRefExpr 0x5293190 <col:21> 'int' EnumConstant 0x5292dd0 'FIND' 'int'
    |-IfStmt 0x52932f8 <line:7:5, line:9:5>
    | |-<<<NULL>>>
    | |-<<<NULL>>>
    | |-BinaryOperator 0x5293280 <line:7:9, col:19> 'int' '=='
    | | |-ImplicitCastExpr 0x5293250 <col:9> 'unsigned int' <IntegralCast>
    | | | `-ImplicitCastExpr 0x5293238 <col:9> 'ACTION':'ACTION' <LValueToRValue>
    | | |   `-DeclRefExpr 0x52931e8 <col:9> 'ACTION':'ACTION' lvalue Var 0x5293130 'action' 'ACTION':'ACTION'
    | | `-ImplicitCastExpr 0x5293268 <col:19> 'unsigned int' <IntegralCast>
    | |   `-DeclRefExpr 0x5293210 <col:19> 'int' EnumConstant 0x5292dd0 'FIND' 'int'