[Issue 18594] X is not an lvalue should have a better error message

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18594

duser at neet.fi changed:

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                 CC|                            |duser at neet.fi

--- Comment #6 from duser at neet.fi ---
the same error message is given when taking the address of a non-lvalue, but
"cannot be modified" doesn't necessarily apply there (and can be confusing)

// Error: `a[0..2]` is not an lvalue and cannot be modified
ubyte[2] a;
const void* p1 = &a[0..2];

// Error: cannot modify constant `1`
const void* p2 = &1;

for these, the message should rather say something like "cannot have its
address taken"

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