Transmute size errors use incorrect/dummy span.

[huonw]

// nothing here

fn main() {
    unsafe { std::cast::transmute::<u64, u8>(1) };
}

transmute-span.rs:1:0: 1:0 error: transmute called on types with different sizes: u64 (64 bits) to u8 (8 bits)
transmute-span.rs:1 // nothing here
                    ^

[huonw]

Nominating for production ready.

[emberian]

Still relevant.

[jdm]

This is marked easy. Is that actually the case?

[jdm]

Looks like it may be:

                let sp = match ccx.tcx.items.get_copy(&ref_id.get()) {
                    ast_map::node_expr(e) => e.span,
                    _ => fail!("transmute has non-expr arg"),
                };

We're in trans_intrinsic, and item is an ast::foreign_item that has a span property. It's worth a shot.

[jdm]

This is just #1972 again, isn't it? transmute is an inlined item from libstd, so we freak out like usual. Nothing easy about this.

[catamorphism]

Main bug is #1972, which is already on a milestone. Closing as dup.