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Utf8String doesn't work with pattern matching #60747

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hez2010 opened this issue Apr 14, 2022 · 2 comments
Closed

Utf8String doesn't work with pattern matching #60747

hez2010 opened this issue Apr 14, 2022 · 2 comments
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Area-Compilers Area-Language Design Resolution-By Design The behavior reported in the issue matches the current design untriaged Issues and PRs which have not yet been triaged by a lead
Milestone
17.3

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@hez2010
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hez2010 commented Apr 14, 2022 •
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Version Used: master

Steps to Reproduce:

I try to use pattern matching with Utf8String but seems that it is not yet supported.

https://sharplab.io/#v2:EYLgtghglgdgPgAQEwEYCwAoTsAuACAMQHsiUAKAJQFMIATAeRgBsBPAZQAcIYAeYFnFQB8eAM4BKTAG9MeOXgQB2MWIDuUHAGMAFrPkyM8o3gBEAMxImArgA48AXhEoANHuOngEAE7W7jvEiuhu54APoOIgAMbngAvgDcmLGY2DD4xERIZJzcfALCYpIYBkZKKqLqWrrBciUh5pa2EXguMUYmnj5N/oFt8uH+0TVxiRjJWBi4hCQAzGT8ggDaALqF0jFlomoaOjF17g1Evs2tw+2dxz1BIWHNQ0YJSUA===

Expected Behavior:

Code can be compiled.

Actual Behavior:

error CS0150: A constant value is expected
@dotnet-issue-labeler dotnet-issue-labeler bot added Area-Compilers untriaged Issues and PRs which have not yet been triaged by a lead labels Apr 14, 2022
@Youssef1313
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This behavior is by design. A utf8 string isn't a constant (it's lowered to byte array creation). So it cannot be used in pattern matching. You also cannot assign it to a constant.

@jcouv jcouv mentioned this issue Apr 15, 2022
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@jcouv
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jcouv commented Apr 15, 2022

Tagging @AlekseyTs as FYI.
Closing as by design. We're tracking this language question in #58848 (under language design meeting "LDM" section).

@jcouv jcouv closed this as completed Apr 15, 2022
@jcouv jcouv added Resolution-By Design The behavior reported in the issue matches the current design Area-Language Design labels Apr 15, 2022
@jcouv jcouv added this to the 17.3 milestone Apr 15, 2022
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Area-Compilers Area-Language Design Resolution-By Design The behavior reported in the issue matches the current design untriaged Issues and PRs which have not yet been triaged by a lead
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Milestone
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