WGSL: function parameters act like const declarations, not var declarations #1171
Description
Example:
fn f(a: f32) -> f32 {
// This should treat 'a' as if it were a const declaration, where its value is taken to be the argument value provided
// at runtime by the caller.
// In particular, you assign to 'a'.
var b : f32 = a; // this is fine
a = 12.0; /// this should be invalid.
return a;
}
One reason this is required is that we need to support formal arguments that are pointers. But a pointer is not storable, and so it can't go into a 'var'. But a const can hold a pointer value.