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6b52293f4d
Netlink descriptions contain tons of code duplication,
and need much more for proper descriptions. Introduce
type templates to simplify writing such descriptions
and remove code duplication.
Note: type templates are experimental, have poor error handling
and are subject to change.
Type templates can be declared as follows:
```
type buffer[DIR] ptr[DIR, array[int8]]
type fileoff[BASE] BASE
type nlattr[TYPE, PAYLOAD] {
nla_len len[parent, int16]
nla_type const[TYPE, int16]
payload PAYLOAD
} [align_4]
```
and later used as follows:
```
syscall(a buffer[in], b fileoff[int64], c ptr[in, nlattr[FOO, int32]])
```
