added tests for completions being called and fixed an issue with let

[dietmarkuehl]

No description provided.

[coveralls]

coverage: 95.542%. remained the same — test-completion-signatures into main

[Copilot]

Pull request overview

Adds a small testing sender adapter to verify that senders’ advertised completion signatures correspond to completion calls that can actually be made, and updates let’s completion signature computation to include set_error(exception_ptr) when the let function may throw.

Changes:

• Add test::completion_test sender wrapper that converts any completion (set_value/set_error/set_stopped) into a set_value() completion for use with sync_wait.
• Add new completion-signature smoke tests for just and let_value pipelines.
• Fix let completion signatures to include set_error_t(std::exception_ptr) when invoking the provided function is not noexcept.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
tests/beman/execution/include/test/completion_test.hpp	New test helper sender/receiver used to validate that advertised completions are callable.
tests/beman/execution/exec-let.test.cpp	Adds a let_value completion-signature test using the new helper.
tests/beman/execution/exec-just.test.cpp	Adds just/just_error/just_stopped completion-signature tests using the new helper.
include/beman/execution/detail/let.hpp	Extends let completion-signature computation to account for potentially-throwing Fun invocation.

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