feat(core): add source-location macro to Dynamic

Author: sqrew

core/Dynamic.carp

@@ -123,3 +123,7 @@ integers [`imod`](#imod).")
 
 (defndynamic add-c [relpath]
   (Project.config "cmod" (relative-to (current-file) relpath)))
+
+(doc source-location "Returns a string representing the file and line number of the given AST node. Useful for building custom logging and profiling macros.")
+(defmacro source-location [x]
+  (Dynamic.String.concat [(eval (list 'file x)) ":" (str (eval (list 'line x)))]))