Compiler Error for Unicode escape exceeding max value inside a Raw String

[tajmone]

Describe the bug

While playing around and testing with escape sequences, I encountered a compiler error which seems odd: An invalid escape sequence inside raw string raises an error, even though it's not supposed to be treated as an escape.

Reproduction Steps

The following line of code:

println(r'Unicode escape: \u0000004B (= K)')

raises the following compiler error:

error: unicode character exceeds max allowed value of 0x10ffff, consider using a unicode literal (\u####)

... even though it's a raw string and escape sequences inside it should be ignored.

Expected Behavior

If I change the above line to use a 32-bit Unicode escape (i.e. \U instead of \u):

println(r'Unicode escape: \U0000004B (= K)')

the compiler error goes away, and the compiled code prints:

Unicode escape: \U000004B (= K)

(as expected: the escape sequence is ignored, and not converted into the character it represents)

Current Behavior

It seems like the compiler is trying to validate escape sequences inside raw strings, even though they won't actually be expanded in the final code.

Possible Solution

No response

Additional Information/Context

No response

V version

0.4.6 4302f86

Environment details (OS name and version, etc.)

Windows 10 Home x64.

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