Error: Not a single literal in UnionTrait.php:1189

[brusch]

We're getting the following error when running agains our code-base:

Uncaught InvalidArgumentException: Not a single literal in /composer/vendor/vimeo/psalm/src/Psalm/Type/UnionTrait.php:1189
Stack trace:
#0 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/Statements/Expression/Call/ArrayFunctionArgumentsAnalyzer.php(400): Psalm\Type\Union->getSingleLiteral()
#1 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/Statements/Expression/Call/ArgumentsAnalyzer.php(109): Psalm\Internal\Analyzer\Statements\Expression\Call\ArrayFunctionArgumentsAnalyzer::handleSplice()
#2 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/Statements/Expression/Call/FunctionCallAnalyzer.php(179): Psalm\Internal\Analyzer\Statements\Expression\Call\ArgumentsAnalyzer::analyze()
#3 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/Statements/ExpressionAnalyzer.php(295): Psalm\Internal\Analyzer\Statements\Expression\Call\FunctionCallAnalyzer::analyze()
#4 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/Statements/ExpressionAnalyzer.php(85): Psalm\Internal\Analyzer\Statements\ExpressionAnalyzer::handleExpression()
#5 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/StatementsAnalyzer.php(559): Psalm\Internal\Analyzer\Statements\ExpressionAnalyzer::analyze()
#6 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/StatementsAnalyzer.php(194): Psalm\Internal\Analyzer\StatementsAnalyzer::analyzeStatement()
#7 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/Statements/Block/IfElse/ElseIfAnalyzer.php(258): Psalm\Internal\Analyzer\StatementsAnalyzer->analyze()
#8 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/Statements/Block/IfElseAnalyzer.php(281): Psalm\Internal\Analyzer\Statements\Block\IfElse\ElseIfAnalyzer::analyze()
#9 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/StatementsAnalyzer.php(513): Psalm\Internal\Analyzer\Statements\Block\IfElseAnalyzer::analyze()
#10 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/StatementsAnalyzer.php(194): Psalm\Internal\Analyzer\StatementsAnalyzer::analyzeStatement()
#11 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/FunctionLikeAnalyzer.php(471): Psalm\Internal\Analyzer\StatementsAnalyzer->analyze()
#12 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/ClassAnalyzer.php(1786): Psalm\Internal\Analyzer\FunctionLikeAnalyzer->analyze()
#13 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/ClassAnalyzer.php(415): Psalm\Internal\Analyzer\ClassAnalyzer->analyzeClassMethod()
#14 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/FileAnalyzer.php(203): Psalm\Internal\Analyzer\ClassAnalyzer->analyze()
#15 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Codebase/Analyzer.php(1581): Psalm\Internal\Analyzer\FileAnalyzer->analyze()
#16 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Codebase/Analyzer.php([522](https://github.com/pimcore/pimcore/actions/runs/4730430903/jobs/8394133073?pr=14945#step:4:524)): Psalm\Internal\Codebase\Analyzer->analysisWorker()
#17 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Codebase/Analyzer.php(272): Psalm\Internal\Codebase\Analyzer->doAnalysis()
#18 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/ProjectAnalyzer.php(560): Psalm\Internal\Codebase\Analyzer->analyzeFiles()
#19 /composer/vendor/vimeo/psalm/src/Psalm/Internal/Cli/Psalm.php(373): Psalm\Internal\Analyzer\ProjectAnalyzer->check()
#20 /composer/vendor/vimeo/psalm/psalm(9): Psalm\Internal\Cli\Psalm::run()
#21 /composer/vendor/bin/psalm(120): include('...')
#22 {main}
(Psalm dev-master@e2957a163190c1f5bd057f4ecbaab4b96098a94a crashed due to an uncaught Throwable)

Details see also:
https://github.com/pimcore/pimcore/actions/runs/4730430903/jobs/8394133073?pr=14945#step:4:515

Actually there's no info why this error is happening and if there's something wrong with our code.

[psalm-github-bot]

Hey @brusch, can you reproduce the issue on https://psalm.dev ?

[brusch]

Seems to be related with version 5.9.0 - using docker://ghcr.io/psalm/psalm-github-actions:5.8.0 works like a charm.
See: pimcore/pimcore#14951

[orklah]

It's related to 02f8f11

@whizsid could you take a look? It seems you called getSingleLiteral in a context where we could have multiple literals in the Union

note: the issue is only on master. No release was made since

[whizsid]

@orklah I am checking it.