u8 doesn't map to known type in MSVC-build debug info

[AndrewGaspar]

I've built a rust program with this source code, compiling with the stable-x86_64-pc-windows-msvc toolchain:

fn main() {
    let some_8_bit_values = [0u8,1,2,3];
    let some_16_bit_values = [0u16,1,2,3];
    let some_32_bit_values = [0u32,1,2,3];
    let some_64_bit_values = [0u64,1,2,3];

    println!("Hello, world!");
}

I debugged the program with windbg. After all four arrays are initialized, I ran dv:

0:000> dv
Type information missing error for some_8_bit_values
some_16_bit_values = unsigned short [4]
some_32_bit_values = unsigned int [4]
some_64_bit_values = unsigned int64 [4]

The u16, u32, and u64 values all map to well known C-types of the same width, and windbg is able to display useful information about them, as if they were typical C-arrays:

0:000> dx some_16_bit_values
some_16_bit_values                 [Type: unsigned short [4]]
    [0]              : 0x0 [Type: unsigned short]
    [1]              : 0x1 [Type: unsigned short]
    [2]              : 0x2 [Type: unsigned short]
    [3]              : 0x3 [Type: unsigned short]

However, it appears that windbg can't do anything useful with the u8 array:

0:000> dx some_8_bit_values
Type information missing error for some_8_bit_values
Error: Unable to bind name 'some_8_bit_values'

I'm trying to write some NatVis visualizations for Rust debugging in windbg/the VS debugger, and this is making it difficult to write visualizations for std::string::String, for example.

I'd be happy to submit a patch myself, I'm just not familiar enough with the code to know where to start.

[AndrewGaspar]

Sorry, this seems to be a duplicate of #36646. Closing issue.