A structure literal consists of the structure path followed by the body. The trailing list separator is optional.
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 = expressionStructure: variable,
The field of a structure is accessed with a dot.
Structure fields can be mutated.
structure.field = expression