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cgen: fix implicit the optional return value to have .ok = true, in anon fn()?{}
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@ -183,7 +183,14 @@ fn (mut g Gen) gen_fn_decl(it ast.FnDecl, skip bool) {
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default_expr := g.type_default(it.return_type)
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// TODO: perf?
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if default_expr == '{0}' {
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if it.return_type.idx() == 1 && it.return_type.has_flag(.optional) {
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// The default return for anonymous functions that return `?,
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// should have .ok = true set, otherwise calling them with
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// optfn() or { panic(err) } will cause a panic:
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g.writeln('\treturn (Option_void){.ok = true};')
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} else {
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g.writeln('\treturn ($type_name)$default_expr;')
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}
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} else {
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g.writeln('\treturn $default_expr;')
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}
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25
vlib/v/tests/anon_fn_returning_question_test.v
Normal file
25
vlib/v/tests/anon_fn_returning_question_test.v
Normal file
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@ -0,0 +1,25 @@
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type FnCb = fn (a string, b int) ?
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fn test_calling_an_anon_function_returning_question() {
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create_and_call_anon_function() or { panic(err) }
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}
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fn create_and_call_anon_function() ? {
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x := fn (a string, b int) ? {
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println('test')
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// NB: the anon function does NOT return explicitly,
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// so V should generate an implicit "OK" value and
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// return it. Previously, it created an implicit optional
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// filled with 0s => .ok was false, and that was treated
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// as a failure, triggering or blocks.
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}
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should_not_call_block(x) ?
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assert true
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}
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fn should_not_call_block(func FnCb) ? {
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func('abc', 123) or {
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println('this should NOT be called')
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assert false
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}
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}
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