Improve syntax for ink! e2e `runtime_only` attribute argument

[davidsemakula]

Summary

Closes #_

• [n] y/n | Does it introduce breaking changes?
• [n] y/n | Is it dependant on the specific version of cargo-contract or pallet-contracts?

Use #[darling(word)] to enable writing #[ink_e2e::test(backend(runtime_only))] instead of #[ink_e2e::test(backend(runtime_only()))]

Description

• Bump darling to 0.20.4
• Update parser for ink! e2e runtime_only attribute argument by using #[darling(word)] to enable writing #[ink_e2e::test(backend(runtime_only))] instead of #[ink_e2e::test(backend(runtime_only()))]

See https://github.com/TedDriggs/darling/pull/260 and https://github.com/TedDriggs/darling/blob/master/examples/heterogeneous_enum_and_word.rs for details.

Checklist before requesting a review

• [x] My code follows the style guidelines of this project
• [x] I have added an entry to CHANGELOG.md
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] Any dependent changes have been merged and published in downstream modules

[codecov-commenter]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (56a3025) 53.70% compared to head (5927d8c) 53.69%. Report is 7 commits behind head on master.

Files	Patch %	Lines
crates/e2e/macro/src/config.rs	0.00%	4 Missing :warning:
crates/e2e/macro/src/codegen.rs	0.00%	3 Missing :warning:
crates/e2e/src/contract_build.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2083 +/- ## ========================================== - Coverage 53.70% 53.69% -0.01% ========================================== Files 223 223 Lines 7040 7043 +3 Branches 3141 3121 -20 ========================================== + Hits 3781 3782 +1 - Misses 3259 3261 +2 ```

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[github-actions[bot]]

🦑 📈 ink! Example Contracts ‒ Changes Report 📉 🦑

These are the results when building the integration-tests/* contracts from this branch with cargo-contract and comparing them to ink! master:

Contract	Upstream Size (kB)	PR Size (kB)	Diff (kB)	Diff (%)	Change
basic-contract-caller	3.303	3.303	0	0	:heavy_minus_sign:
basic-contract-caller/other-contract	1.583	1.583	0	0	:heavy_minus_sign:
call-builder-return-value	9.169	9.169	0	0	:heavy_minus_sign:
call-runtime	2.061	2.061	0	0	:heavy_minus_sign:
combined-extension	2.12	2.12	0	0	:heavy_minus_sign:
conditional-compilation	1.49	1.49	0	0	:heavy_minus_sign:
contract-storage	7.568	7.568	0	0	:heavy_minus_sign:
contract-terminate	1.329	1.329	0	0	:heavy_minus_sign:
contract-transfer	1.689	1.689	0	0	:heavy_minus_sign:
custom-allocator	7.692	7.692	0	0	:heavy_minus_sign:
custom-environment	2.146	2.146	0	0	:heavy_minus_sign:
dns	7.318	7.318	0	0	:heavy_minus_sign:
e2e-call-runtime	1.296	1.296	0	0	:heavy_minus_sign:
e2e-runtime-only-backend	1.881	1.881	0	0	:heavy_minus_sign:
erc1155	14.237	14.237	0	0	:heavy_minus_sign:
erc20	6.918	6.918	0	0	:heavy_minus_sign:
erc721	9.873	9.873	0	0	:heavy_minus_sign:
events	5.258	5.258	0	0	:heavy_minus_sign:
flipper	1.639	1.639	0	0	:heavy_minus_sign:
incrementer	1.504	1.504	0	0	:heavy_minus_sign:
lang-err-integration-tests/call-builder-delegate	2.638	2.638	0	0	:heavy_minus_sign:
lang-err-integration-tests/call-builder	5.066	5.066	0	0	:heavy_minus_sign:
lang-err-integration-tests/constructors-return-value	1.985	1.985	0	0	:heavy_minus_sign:
lang-err-integration-tests/contract-ref	4.629	4.629	0	0	:heavy_minus_sign:
lang-err-integration-tests/integration-flipper	1.815	1.815	0	0	:heavy_minus_sign:
lazyvec-integration-test	4.616	4.616	0	0	:heavy_minus_sign:
mapping-integration-tests	7.999	7.999	0	0	:heavy_minus_sign:
mother	12.741	12.741	0	0	:heavy_minus_sign:
multi-contract-caller	6.106	6.106	0	0	:heavy_minus_sign:
multi-contract-caller/accumulator	1.378	1.378	0	0	:heavy_minus_sign:
multi-contract-caller/adder	1.968	1.968	0	0	:heavy_minus_sign:
multi-contract-caller/subber	1.988	1.988	0	0	:heavy_minus_sign:
multisig	21.688	21.688	0	0	:heavy_minus_sign:
payment-channel	5.659	5.659	0	0	:heavy_minus_sign:
psp22-extension	7.071	7.071	0	0	:heavy_minus_sign:
rand-extension	2.965	2.965	0	0	:heavy_minus_sign:
sr25519-verification	1.142	1.142	0	0	:heavy_minus_sign:
static-buffer	1.654	1.654	0	0	:heavy_minus_sign:
trait-dyn-cross-contract-calls	2.793	2.793	0	0	:heavy_minus_sign:
trait-dyn-cross-contract-calls/contracts/incrementer	1.545	1.545	0	0	:heavy_minus_sign:
trait-erc20	7.294	7.294	0	0	:heavy_minus_sign:
trait-flipper	1.49	1.49	0	0	:heavy_minus_sign:
trait-incrementer	1.614	1.614	0	0	:heavy_minus_sign:
upgradeable-contracts/delegator	3.151	3.151	0	0	:heavy_minus_sign:
upgradeable-contracts/delegator/delegatee	1.609	1.609	0	0	:heavy_minus_sign:
upgradeable-contracts/set-code-hash	1.743	1.743	0	0	:heavy_minus_sign:
upgradeable-contracts/set-code-hash/updated-incrementer	1.721	1.721	0	0	:heavy_minus_sign:
wildcard-selector	2.846	2.846	0	0	:heavy_minus_sign:

Link to the run | Last update: Tue Jan 30 05:45:51 CET 2024