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adding errors for useless type hints

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Jakub Doka 2024-11-11 22:34:42 +01:00
parent d99672b751
commit ad7fb5d0fc
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GPG key ID: C6E9A89936B8C143
2 changed files with 12 additions and 6 deletions
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6
lang/README.md
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@ -646,7 +646,7 @@ main := fn(): int {
i -= 1
}
// b g r
put_pixel(.(x, y), .(@as(u8, @intcast(i)), @as(u8, @intcast(i)), @as(u8, @intcast(i)), 255))
put_pixel(.(x, y), .(@intcast(i), @intcast(i), @intcast(i), 255))
}
}
@ -1030,7 +1030,7 @@ main := fn(): uint {
```hb
Color := struct {r: u8, g: u8, b: u8, a: u8}
white := Color.(255, 255, 255, 255)
u32_to_color := fn(v: u32): Color return @as(Color, @bitcast(u32_to_u32(@bitcast(v))))
u32_to_color := fn(v: u32): Color return @bitcast(u32_to_u32(@bitcast(v)))
u32_to_u32 := fn(v: u32): u32 return v
main := fn(): uint {
return u32_to_color(@bitcast(white)).r
@ -1399,7 +1399,7 @@ main := fn(): uint {
}
n = 1
loop if n >= 10 break else {
*(@as(^[u8; 1024], @bitcast(&back_buffer)) + n) = *@as(^[u8; 1024], @bitcast(&back_buffer))
*(@as(^[u8; 1024], @bitcast(&back_buffer)) + n) = *@bitcast(&back_buffer)
n += 1
}
return back_buffer[1024 * 2]

12
lang/src/son.rs
View file

@ -3168,10 +3168,16 @@ impl<'a> Codegen<'a> {
self.tys,
))
}
Expr::Directive { name: "as", args: [ty, expr], .. } => {
Expr::Directive { name: "as", args: [ty, expr], pos } => {
let ty = self.ty(ty);
let ctx = Ctx::default().with_ty(ty);
let mut val = self.raw_expr_ctx(expr, ctx)?;
let mut val = self.raw_expr_ctx(expr, Ctx::default().with_ty(ty))?;
if let Some(ity) = ctx.ty
&& ity.try_upcast(ty) == Some(ty)
&& val.ty == ity
{
self.report(pos, "the type is known at this point, remove the hint");
}
self.strip_var(&mut val);
self.assert_ty(expr.pos(), &mut val, ty, "hinted expr");
Some(val)