LYR-PAR0002

an expression is missing

error · spec 02-grammar

An expression is needed — after =, as an argument, an operand, a returned value — and the token there begins none.

Explanation

Where the grammar takes a value, a token that cannot begin an expression (a ;, a ), a keyword such as else) leaves the place empty. The declaration that holds the gap reports this and nothing that would follow from it.

Write the missing expression, or remove what expects one.

Wrong

fn main(): void {
    let a = ;
}

Right

fn main(): void {
    let a = 0;
    let _ = a;
}