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checker: make sure `is` is only used with interfaces and sum types

pull/5115/head
Alexander Medvednikov 2020-05-29 06:45:58 +02:00
parent 4b362862ad
commit 1c11ac9fdf
1 changed files with 3 additions and 0 deletions
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3
vlib/v/checker/checker.v
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@ -538,6 +538,9 @@ pub fn (mut c Checker) infix_expr(mut infix_expr ast.InfixExpr) table.Type {
if typ_sym.kind == .placeholder {
c.error('is: type `${typ_sym.name}` does not exist', type_expr.pos)
}
if left.kind != .interface_ && left.kind != .sum_type {
c.error('`is` can only be used with interfaces and sum types', type_expr.pos)
}
return table.bool_type
}
else {}