Running of automatically generated Lua programs sometimes failed due
to semantic errors like:

- "attempt to index" (16%)
- "attempt to perform arithmetic on" (12%)
- "attempt to call" (11%)
- "attempt to concatenate" (3%)
- "attempt to get length of" (1%)

Example of an error "attempt to index" is the following:

```
Name0 = 'Name';
function Name0:Name4()
end
```

These errors are happened because Lua objects have no appropriate
metamethods and therefore these operations are not applicable:

- "attempt to index": missed `__index` metamethod
- "attempt to call": missed `__call` metamethod
- "attempt to perform arithmetic on": missed metamethods that
  implements arithmetic operations
- "attempt to get length of": missed `__len` metamethod
- "attempt to concatenate": missed `__concat` metamethod

The patch defines a Lua metatables [1] and set this metatables
to a Lua values.

1. https://www.lua.org/manual/5.1/manual.html#2.8

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