Warn about functions used before their declaration. Its not technically an error like the "var used before declaration" because functions are "hoisted up" and therefore available even before their declaration, so create a new warning category for it instead of reusing the "var used before declaration" category. Disable the warning by default: Qt Creator used to have it as default, while other tools like eslint don't. For the same reason, don't warn about functions used before declaration during codegen, and add a method to warn about it in CodeGenWarningInterface. The code for "var used before declaration" can be reused by function declarations by adding a sourcelocation for function declarations in the "addLocalVar"-call, so make sure to differentiate between functions and vars by adding an extra member to Context::ResolvedName. Task-number: QTBUG-129307 Change-Id: I83a4f8cd00c120db23a0cec3365a00ed44de2836 Reviewed-by: Olivier De Cannière <olivier.decanniere@qt.io>