# compile/pragma

**Syntax:** `(pragma [NS/KEY VALUE ...] ...)` to set, `(pragma NS/KEY)` to
read one setting, `(pragma)` for the module's pragma object.

**Behaviour:** The set form controls the module's reader and compiler
settings. Each bracketed form is one setting: a slash-namespaced key
followed by positional or keyword values, and a bare `[NS/KEY]` selects
the setting's default. It expands to
`(setq __pragma__ (.rebuild __pragma__ ...))`, so the change applies to
everything read and compiled after it in this module and to nothing
imported. Values are expressions: a literal symbol is quoted, while
booleans, numbers, and strings are bare.

`(pragma NS/KEY)` reads the current value as `(item __pragma__ "NS/KEY")`.
`(help pragma)` lists every setting with its default, and
`(help (pragma NS/KEY))` documents one.

**Examples:**

```koskari
(pragma [compiler/call-brackets 'error]
        [reader/brackets False])

(pragma [compiler/pack-module False])
```

```koskari
>>> (pragma compiler/call-brackets)
<BracketCalls.WARN: 'warn'>
>>> (pragma reader/layout)
True
```

**See also:** [Pragmas and feature settings](../../guide/pragma.md) for
every setting and its values.