# E3020

Unexpected `=` in struct expression. The correct syntax for struct expression is
`{ field: expression }`.

## Erroneous example

```{literalinclude} /sources/error_codes/3020_error/top.mbt
:language: moonbit
```

## Suggestion

Change the struct expression to use the correct syntax:

```{literalinclude} /sources/error_codes/3020_fixed/top.mbt
:language: moonbit
```