Inconsistent expression evaluation result if type name conflicts with variable name

Bug type: Debugger

• OS and Version: Windows 10
• VS Code Version: 1.60.1
• C/C++ Extension Version: 1.6.0

Source C code to reproduce (compiled with cl.exe /Zi)

typedef struct foo {
    int a;
} foo_t;

foo_t foo;

int main(int argc, char *argv[])
{
    return foo.a;
}

Steps to reproduce the behavior:

1. Set a breakpoint in main
2. Start debugging
3. In debug console type foo twice, and the result is different

It seems that the evaluation result of foo for the second time is "class" instead of "data"
The first evaluation result:
foo
-> (C) {"command":"evaluate","arguments":{"expression":"foo","frameId":1000,"context":"repl"},"type":"request","seq":17}
<- (R) {"seq":711,"type":"response","request_seq":17,"success":true,"command":"evaluate","body":{"result":"{a=0 }","type":"foo","presentationHint":{"kind":"data","attributes":["readOnly","static"]},"variablesReference":1003,"evaluateResponseReference":1003}}

The second evaluation result:
-> (C) {"command":"evaluate","arguments":{"expression":"foo","frameId":1000,"context":"repl"},"type":"request","seq":20}
<- (R) {"seq":720,"type":"response","request_seq":20,"success":true,"command":"evaluate","body":{"result":"","presentationHint":{"kind":"class","attributes":["readOnly"]},"variablesReference":0,"evaluateResponseReference":1007}}

Start by reproducing the issue in the VS Code debug console with the provided C source and cl.exe /Zi, then inspect how repeated evaluate requests for foo are handled. Compare the first and second responses, especially presentationHint and variablesReference; done means repeated evaluation consistently reports the variable data rather than a class.