[clang-format] simple-requirements not formatted as expressions

[rymiel]

Related to #121471.

Input and expected result:

template <typename T>
concept Multiplicable = requires(T a, T b) { a * b; };

Actual result:

template <typename T>
concept Multiplicable = requires(T a, T b) { a *b; };

Note that a simple-requirement is just an expression. Clang-format should be treating the contents of a requirement-body as an expression context but it is not doing so.

[llvmbot]

@llvm/issue-subscribers-clang-format

Author: Emilia Kond (rymiel)

Related to https://github.com//issues/121471.

Input and expected result:

template <typename T>
concept Multiplicable = requires(T a, T b) { a * b; };

Actual result:

template <typename T>
concept Multiplicable = requires(T a, T b) { a *b; };

Note that a simple-expression is just an expression. Clang-format should be treating the contents of a requirement-body as an expression context but it is not doing so.

[owenca]

Note that a simple-requirement is just an expression. Clang-format should be treating the contents of a requirement-body as an expression context but it is not doing so.

Actually, a simple requirement is an expression statement, i.e. an expression followed by a semicolon. Also, a requirement body can have type requirements, which are not even expression statements. The only expression context (without a terminating semicolon) is between the braces of a compound requirement. #121471 is the latter case and fixed by #121539.