Can't negate non constants in default procedure parameters

[Skytrias]

Context

• Operating System: Linux Mint 20 - Kernel 5.4.0-73-generic
• Please paste odin version output: odin version dev-2021-07:f7413ca9

Expected Behavior

Negate a default procedure parameter just like constants are allowed to be negated.

Current Behavior

Works as expected on constants, but doesn't on "non constants".

Steps to Reproduce

TEST :: 0.1;
non_constant: f32 = 0.2;
a :: proc(param1: f32 = -TEST, param2: f32 = -non_constant) {
    fmt.println("hi", param1, param2);
}
main :: proc() {
    a();
}

Failure Logs

/home/michael/Schreibtisch/experimental/main.odin(17:46) Default parameter must be a constant, 2
/home/michael/Schreibtisch/experimental/main.odin(22:2) Too few arguments for 'a', expected 2 arguments, got 0

[gingerBill]

This is not a bug but it does require a better error message

[Skytrias]

okay :+1:

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