[Version 10.0] Feature support for record with sealed ToString#1550
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RexJaeschke wants to merge 2 commits into
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[Version 10.0] Feature support for record with sealed ToString#1550RexJaeschke wants to merge 2 commits into
RexJaeschke wants to merge 2 commits into
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RexJaeschke
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type: feature
RexJaeschke
marked this pull request as draft
January 24, 2026 16:14
Contributor
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The proposal exists as dotnet/csharplang#4174. I would be happy to review this, as the original author. |
jnm2
approved these changes
Jan 26, 2026
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| The method may be declared explicitly. It is an error if the explicit declaration does not match the expected signature or accessibility, or if the explicit declaration doesn't allow overriding it in a derived type and the record class type is not sealed. It is an error if either synthesized, or explicitly declared, method doesn't override `object.ToString()` (for example, due to shadowing in intermediate base types). | ||
| The method may be declared explicitly. It is an error if the explicit declaration does not match the expected signature or accessibility. It is an error if either synthesized, or explicitly declared, method doesn't override `object.ToString()` (for example, due to shadowing in intermediate base types). |
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The removed statement is a consequence of the requirement that the member overrides object.ToString().
Suggested change
| The method may be declared explicitly. It is an error if the explicit declaration does not match the expected signature or accessibility. It is an error if either synthesized, or explicitly declared, method doesn't override `object.ToString()` (for example, due to shadowing in intermediate base types). | |
| The method may be declared explicitly. It is an error if either synthesized, or explicitly declared, method doesn't override `object.ToString()` (for example, due to shadowing in intermediate base types). |
| The method may be declared explicitly. It is an error if the explicit declaration does not match the expected signature or accessibility, or if the explicit declaration doesn't allow overriding it in a derived type and the record class type is not sealed. It is an error if either synthesized, or explicitly declared, method doesn't override `object.ToString()` (for example, due to shadowing in intermediate base types). | ||
| The method may be declared explicitly. It is an error if the explicit declaration does not match the expected signature or accessibility. It is an error if either synthesized, or explicitly declared, method doesn't override `object.ToString()` (for example, due to shadowing in intermediate base types). | ||
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| Sealing an explicitly declared `ToString` method prevents the compiler from synthesizing a `ToString` method for any derived record types. However, this does not prevent the compiler from synthesizing `PrintMembers`. |
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Remove unnecessary blank lines from classes.md
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An earlier version of this feature is already present on |
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There is no corresponding MS proposal.
This PR builds on V9's PR #1458, which as of this time has not been reviewed, and changes during its adoption may impact this PR.