Add Unicode out-of-range example to CS1009 compiler error documentation #47963
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Co-authored-by: BillWagner <493969+BillWagner@users.noreply.github.com>
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BillWagner
August 14, 2025 13:00
gewarren
approved these changes
Aug 15, 2025
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This PR adds a missing example to the CS1009 compiler error documentation that demonstrates when a well-formed Unicode escape sequence represents an out-of-range value.
The new example shows:
The Unicode escape sequence
\U00110000is syntactically correct (8 hexadecimal digits as required), but it represents the code point U+110000, which is above the valid Unicode range limit of U+10FFFF. This causes CS1009 even though the escape sequence format is well-formed.This addition provides developers with a complete understanding of the different scenarios that can trigger CS1009, including syntax errors in escape sequences and semantically invalid Unicode values.
Fixes #40741.
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