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v2: handle optional in return stmt in checker

pull/3880/head
Joe Conigliaro 2020-02-29 16:32:00 +11:00
parent 8e013d2174
commit 236b7b15bb
1 changed files with 4 additions and 0 deletions
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4
vlib/v/checker/checker.v
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@ -271,6 +271,7 @@ pub fn (c mut Checker) return_stmt(return_stmt ast.Return) {
}
expected_type := return_stmt.expected_type
expected_type_sym := c.table.get_type_symbol(expected_type)
exp_is_optional := table.type_is_optional(expected_type)
mut expected_types := [expected_type]
if expected_type_sym.kind == .multi_return {
mr_info := expected_type_sym.info as table.MultiReturn
@ -284,6 +285,9 @@ pub fn (c mut Checker) return_stmt(return_stmt ast.Return) {
if !c.table.check(got_typ, exp_typ) {
got_typ_sym := c.table.get_type_symbol(got_typ)
exp_typ_sym := c.table.get_type_symbol(exp_typ)
if got_typ_sym.name == 'Option' && exp_is_optional {
continue
}
c.error('cannot use `$got_typ_sym.name` as type `$exp_typ_sym.name` in return argument', return_stmt.pos)
}
}