> For the complete documentation index, see [llms.txt](https://technocoder.gitbook.io/lexica/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://technocoder.gitbook.io/lexica/reference/expressions.md).

# Expressions

## Structures

A structure literal consists of the structure path followed by the body. The trailing list separator is optional.

```
module::Structure:
    field: expression,
```

If the body is on the same line, it will be terminated by a line break instead of a block close.

```
Structure: field: expression,
```

Nested structure or block fields do not terminate in a list separator.

```
Structure:
    nested: Nested:
        field: expression,
    other: 
        expression
```

A nested structure can be on the same line only if it is the last field in the structure.

```
Structure: field: Nested: field: expression,
```

If the expression is omitted, the field will consume the variable with the same name in its scope.

```
let variable = expression
Structure: variable,
```

## Fields

The field of a structure is accessed with a dot.

```
structure.field
```

Structure fields can be mutated.

```
structure.field = expression
```