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Syntax Errors

The messages for syntax errors are enhanced. They include tailored messages and code snippets, which should help newer programmers identify problems quicker. It's not a game changer, but it's neat.

Example 1​

Problematic Code
pluto
if a < b and t == 5 return "Gottem" end
Emitted Syntax Error
syntax error: file.pluto:1: expected 'then' to delimit condition.
    1 | if a < b and t == 5 return "Gottem" end
      | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ here: expected 'then' symbol.

Example 2​

Problematic Code
pluto
local fn = |a, b, c| => (a == b and a < c)
Emitted Syntax Error
syntax error: file.pluto:1: impromper lambda definition
    1 | local fn = |a, b, c| => (a == b and a < c)
      | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ here: expected '->' arrow syntax for lambda expression.

ANSI Coloring​

These errors support coloring, but it's disabled by default. Define the PLUTO_USE_COLORED_OUTPUT macro in luaconf.h or your build config to enable colored error messages.

tip

For Windows users, you can enable ANSI coloring support with the following command:

  • REG ADD HKCU\CONSOLE /f /v VirtualTerminalLevel /t REG_DWORD /d 1