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### 2657. [filesys.ts] [PDTS] Inappropriate use of "No diagnostic is required"

Section: 2.1 [filesys.ts::fs.conform.9945] Status: TS Submitter: LWG/SG-3 Opened: 2014-02-13 Last modified: 2017-07-30

Priority: Not Prioritized

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Discussion:

Addresses: filesys.ts

§ 2.1 [fs.conform.9945] specifes "No diagnostic is required" for races. That prescription is used by the standard for the core language; it is not appropriate in library specifications. LWG/SG-3 wishes this be changed to undefined behavior.

[Beman comments: The replacment wording is similar to that used by C++14 17.6.4.10]

Proposed resolution:

Change the following paragraph from § 2.1 [fs.conform.9945]

> The behavior of functions described in this Technical Specification may differ from their specification in the presence of file system races ([fs.def.race]). No diagnostic is required.

> Behavior is undefined if calls to functions provided by this Technical Specification introduce a file system race (4.6 [fs.def.race]).

Insert a new sub-section head before the modified paragraph:

> 2.1 File system race behavior [fs.race.behavior]