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checker: fix missing check for empty array to generic param (fix #25056) (#25118)

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Felipe Pena 2025-08-17 14:44:36 -03:00 • committed by GitHub
parent 51630f1795
commit 4a4434ae4a
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3 changed files with 36 additions and 2 deletions
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15
vlib/v/checker/fn.v
View file

@ -1543,8 +1543,11 @@ fn (mut c Checker) fn_call(mut node ast.CallExpr, mut continue_check &bool) ast.
}
}
arg_typ_sym := c.table.sym(arg_typ)
if arg_typ_sym.kind == .none && param.typ.has_flag(.generic) && !param.typ.has_flag(.option) {
c.error('cannot use `none` as generic argument', call_arg.pos)
if param.typ.has_flag(.generic) {
if arg_typ_sym.kind == .none && !param.typ.has_flag(.option) {
c.error('cannot use `none` as generic argument', call_arg.pos)
}
c.check_unresolved_generic_param(node, call_arg)
}
param_typ_sym := c.table.sym(param.typ)
if func.is_variadic && arg_typ.has_flag(.variadic) && args_len - 1 > i {
@ -2573,6 +2576,7 @@ fn (mut c Checker) method_call(mut node ast.CallExpr, mut continue_check &bool)
}
}
if exp_arg_typ.has_flag(.generic) {
c.check_unresolved_generic_param(node, arg)
method_concrete_types := if method_generic_names_len == rec_concrete_types.len {
rec_concrete_types
} else {
@ -2753,6 +2757,13 @@ fn (mut c Checker) handle_generic_lambda_arg(node &ast.CallExpr, mut lambda ast.
}
}
fn (mut c Checker) check_unresolved_generic_param(node &ast.CallExpr, arg ast.CallArg) {
if node.raw_concrete_types.len == 0 && arg.expr is ast.ArrayInit
&& arg.expr.typ == ast.void_type {
c.error('cannot use empty array as generic argument', arg.pos)
}
}
fn (mut c Checker) spawn_expr(mut node ast.SpawnExpr) ast.Type {
ret_type := c.call_expr(mut node.call_expr)
if node.call_expr.or_block.kind != .absent {

13
vlib/v/checker/tests/empty_arr_to_generic_param_err.out Normal file
View file

@ -0,0 +1,13 @@
vlib/v/checker/tests/empty_arr_to_generic_param_err.vv:8:4: error: cannot use empty array as generic argument
6 |
7 | fn main() {
8 | t([])
| ~~
9 | Foo{}.t([])
10 | }
vlib/v/checker/tests/empty_arr_to_generic_param_err.vv:9:10: error: cannot use empty array as generic argument
7 | fn main() {
8 | t([])
9 | Foo{}.t([])
| ~~
10 | }

10
vlib/v/checker/tests/empty_arr_to_generic_param_err.vv Normal file
View file

@ -0,0 +1,10 @@
fn t[T](a []T) {}
struct Foo {}
fn (t &Foo) t[T](a []T) {}
fn main() {
t([])
Foo{}.t([])
}