v.checker: restrict `x T` in `fn test<T>(x T){ unsafe{ println(x[0]) }`, but allow `x &T`
parent
f351ff037e
commit
115edff7e9
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@ -6510,10 +6510,16 @@ pub fn (mut c Checker) index_expr(mut node ast.IndexExpr) ast.Type {
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break
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}
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.any {
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gname := typ_sym.name
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typ = c.unwrap_generic(typ)
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node.left_type = typ
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typ_sym = c.table.get_final_type_symbol(typ)
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continue
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if typ.is_ptr() {
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continue
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} else {
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c.error('generic type $gname does not support indexing, pass an array, or a reference instead, e.g. []$gname or &$gname',
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node.pos)
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}
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}
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else {
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break
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@ -0,0 +1,6 @@
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vlib/v/checker/tests/generic_param_used_as_an_array_err.vv:2:10: error: generic type T does not support indexing, pass an array, or a reference instead, e.g. []T or &T
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1 | fn test<T>(arr T) {
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2 | a := arr[1]
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| ~~~
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3 | println(a)
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4 | }
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@ -0,0 +1,12 @@
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fn test<T>(arr T) {
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a := arr[1]
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println(a)
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}
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fn main() {
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a := [1, 2, 3]!
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test(a)
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b := ['a', 'b', 'c']!
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test(b)
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}
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