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checker: disallow type casting to `none` (#6635)

pull/6640/head
Swastik Baranwal 2020-10-17 22:32:30 +05:30 committed by GitHub
parent 9309a07438
commit acc85be5ae
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 91 additions and 0 deletions
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3
vlib/v/checker/checker.v
View File

@ -2670,6 +2670,9 @@ pub fn (mut c Checker) expr(node ast.Expr) table.Type {
}
} else if node.typ == table.bool_type {
c.error('cannot cast to bool - use e.g. `some_int != 0` instead', node.pos)
} else if node.expr_type == table.none_type {
type_name := c.table.type_to_str(node.typ)
c.error('cannot cast `none` to `$type_name`', node.pos)
}
if node.has_arg {
c.expr(node.arg)

75
vlib/v/checker/tests/none_type_cast_err.out 100644
View File

@ -0,0 +1,75 @@
vlib/v/checker/tests/none_type_cast_err.vv:2:14: error: cannot cast `none` to `string`
1 | fn main() {
2 | _ := string(none)
| ~~~~
3 | _ := int(none)
4 | _ := i8(none)
vlib/v/checker/tests/none_type_cast_err.vv:3:11: error: cannot cast `none` to `int`
1 | fn main() {
2 | _ := string(none)
3 | _ := int(none)
| ~~~~
4 | _ := i8(none)
5 | _ := i16(none)
vlib/v/checker/tests/none_type_cast_err.vv:4:10: error: cannot cast `none` to `i8`
2 | _ := string(none)
3 | _ := int(none)
4 | _ := i8(none)
| ~~~~
5 | _ := i16(none)
6 | _ := i64(none)
vlib/v/checker/tests/none_type_cast_err.vv:5:11: error: cannot cast `none` to `i16`
3 | _ := int(none)
4 | _ := i8(none)
5 | _ := i16(none)
| ~~~~
6 | _ := i64(none)
7 | _ := u16(none)
vlib/v/checker/tests/none_type_cast_err.vv:6:11: error: cannot cast `none` to `i64`
4 | _ := i8(none)
5 | _ := i16(none)
6 | _ := i64(none)
| ~~~~
7 | _ := u16(none)
8 | _ := u32(none)
vlib/v/checker/tests/none_type_cast_err.vv:7:11: error: cannot cast `none` to `u16`
5 | _ := i16(none)
6 | _ := i64(none)
7 | _ := u16(none)
| ~~~~
8 | _ := u32(none)
9 | _ := u64(none)
vlib/v/checker/tests/none_type_cast_err.vv:8:11: error: cannot cast `none` to `u32`
6 | _ := i64(none)
7 | _ := u16(none)
8 | _ := u32(none)
| ~~~~
9 | _ := u64(none)
10 | _ := rune(none)
vlib/v/checker/tests/none_type_cast_err.vv:9:11: error: cannot cast `none` to `u64`
7 | _ := u16(none)
8 | _ := u32(none)
9 | _ := u64(none)
| ~~~~
10 | _ := rune(none)
11 | _ := f32(none)
vlib/v/checker/tests/none_type_cast_err.vv:10:12: error: cannot cast `none` to `rune`
8 | _ := u32(none)
9 | _ := u64(none)
10 | _ := rune(none)
| ~~~~
11 | _ := f32(none)
12 | _ := f64(none)
vlib/v/checker/tests/none_type_cast_err.vv:11:11: error: cannot cast `none` to `f32`
9 | _ := u64(none)
10 | _ := rune(none)
11 | _ := f32(none)
| ~~~~
12 | _ := f64(none)
13 | }
vlib/v/checker/tests/none_type_cast_err.vv:12:11: error: cannot cast `none` to `f64`
10 | _ := rune(none)
11 | _ := f32(none)
12 | _ := f64(none)
| ~~~~
13 | }

13
vlib/v/checker/tests/none_type_cast_err.vv 100644
View File

@ -0,0 +1,13 @@
fn main() {
_ := string(none)
_ := int(none)
_ := i8(none)
_ := i16(none)
_ := i64(none)
_ := u16(none)
_ := u32(none)
_ := u64(none)
_ := rune(none)
_ := f32(none)
_ := f64(none)
}