I just tried to install the extension on s-mw sandbox wiki however for MW 1.35, Maps 7.20, PHP 7.2 it fails with:
- Error
Fatal error: Uncaught ParseError: syntax error, unexpected '–' (T_STRING) in /../w/extensions/CoordinateConversion/includes/CH1903.php:25
- Stack trace
#0 [internal function]: AutoLoader::autoload('CH1903') #1 /../w/includes/parser/Parser.php(4864): spl_autoload_call('CH1903') #2 /../w/extensions/CoordinateConversion/CoordinateConversion.hooks.php(25): Parser->setFunctionHook('wgs84_2ch03', Array) #3 /../w/includes/HookContainer/HookContainer.php(320): CoordinateConversionHooks::onParserFirstCallInit(Object(Parser)) #4 /../w/includes/HookContainer/HookContainer.php(131): MediaWiki\HookContainer\HookContainer->callLegacyHook('ParserFirstCall...', Array, Array, Array) #5 /../w/includes/HookContainer/HookRunner.php(2965): MediaWiki\HookContainer\HookContainer->run('ParserFirstCall...', Array) #6 /../w/includes/parser/Parser.php(532): MediaWiki\HookContainer\HookRunner->onParserFirstCallInit(Object(Parser)) in /../w/includes/parser/Parser.php on line 4864
Talking about the Swiss system here perhaps caused the grump. :D