Compile-time constants

V provides access to some constants at compile time.

@FN – name of the current V function
@METHOD – ReceiverType.MethodName
@MOD – name of the current V module
@STRUCT – name of the current V struct
@FILE – absolute path of the V source file
@LINE – line number where it appears (as a string).
@FILE_LINE – like @FILE:@LINE, but the file part is a relative path
@COLUMN – column where it appears (as a string).
@VEXE – path to the V compiler
@VEXEROOT – folder, where the V executable is (as a string).
@VHASH – shortened commit hash of the V compiler (as a string).
@VMOD_FILE – contents of the nearest v.mod file (as a string).
@VMODROOT – folder, where the nearest v.mod file is (as a string).

That allows you to do the following example, useful while debugging/logging/tracing your code:

eprintln('file: ' + @FILE + ' | line: ' + @LINE + ' | fn: ' + @MOD + '../..' + @FN)

Another example is if you want to embed the version/name from v.mod inside your executable:

import v.vmod vm := vmod.decode(@VMOD_FILE) or { panic(err) } println('${vm.name} ${vm.version}\n ${vm.description}')