Cannot pass literal char into a function expecting char

[ondrejmirtes]

Minimal code:

namespace PHPStanTurbo;

final class Foo
{
    public function peek(char ch) -> void
    {

    }

    public function doFoo() -> void
    {
        this->peek('a');
    }
}

Crashes with:

PHP Fatal error:  Uncaught TypeError: Zephir\Exception\CompilerException::cannotUseValueTypeAs(): Argument #1 ($variable) must be of type Zephir\Variable\Variable, Zephir\LiteralCompiledExpression given, called in /Users/ondrej/Development/phpstan/turbo-ext/vendor/phalcon/zephir/src/Call.php on line 552 and defined in /Users/ondrej/Development/phpstan/turbo-ext/vendor/phalcon/zephir/src/Exception/CompilerException.php:104
Stack trace:
#0 /Users/ondrej/Development/phpstan/turbo-ext/vendor/phalcon/zephir/src/Call.php(552): Zephir\Exception\CompilerException::cannotUseValueTypeAs(Object(Zephir\LiteralCompiledExpression), 'parameter', Array)
#1 /Users/ondrej/Development/phpstan/turbo-ext/vendor/phalcon/zephir/src/MethodCall.php(566): Zephir\Call->getResolvedParams(Array, Object(Zephir\CompilationContext), Array)
#2 /Users/ondrej/Development/phpstan/turbo-ext/vendor/phalcon/zephir/src/StatementsBlock.php(290): Zephir\MethodCall->compile(Object(Zephir\Expression), Object(Zephir\CompilationContext))
#3 /Users/ondrej/Development/phpstan/turbo-ext/vendor/phalcon/zephir/src/Class/Method/Method.php(1011): Zephir\StatementsBlock->compile(Object(Zephir\CompilationContext), false, 0)
#4 /Users/ondrej/Development/phpstan/turbo-ext/vendor/phalcon/zephir/src/Class/Definition/Definition.php(609): Zephir\Class\Method\Method->compile(Object(Zephir\CompilationContext))
#5 /Users/ondrej/Development/phpstan/turbo-ext/vendor/phalcon/zephir/src/CompilerFile.php(378): Zephir\Class\Definition\Definition->compile(Object(Zephir\CompilationContext))
#6 /Users/ondrej/Development/phpstan/turbo-ext/vendor/phalcon/zephir/src/CompilerFile.php(302): Zephir\CompilerFile->compileClass(Object(Zephir\CompilationContext))
#7 /Users/ondrej/Development/phpstan/turbo-ext/vendor/phalcon/zephir/src/Compiler.php(1033): Zephir\CompilerFile->compile(Object(Zephir\Compiler), Object(Zephir\Backend\StringsManager))
#8 /Users/ondrej/Development/phpstan/turbo-ext/vendor/phalcon/zephir/zephir(406): Zephir\Compiler->generate(true)
#9 /Users/ondrej/Development/phpstan/turbo-ext/vendor/phalcon/zephir/zephir(297): generate(false)
#10 /Users/ondrej/Development/phpstan/turbo-ext/vendor/bin/zephir(119): include('/Users/ondrej/D...')
#11 {main}
  thrown in /Users/ondrej/Development/phpstan/turbo-ext/vendor/phalcon/zephir/src/Exception/CompilerException.php on line 104

This exception is thrown:

zephir/src/Call.php

Lines 551 to 556 in 337c6f9

	default:
	throw CompilerException::cannotUseValueTypeAs(
	$compiledExpression,
	'parameter',
	$expression
	);

[ondrejmirtes]

I thought I'd be able to work around it but no:

                let chTmp = '>';
                if ch == '?' && this->peek(chTmp) {

Reports (but does not throw an exception/crash):

Cannot use variable type: char as parameter