Use new formatting of locations

When a location is outputted a new format will now be used:
`<file>:<line>:<column>`.

changelog.md

@@ -6,6 +6,7 @@
 * Added a flag, `--frontend-version`, which will print the version of the
 frontend DLP is using
 * Updated the D frontend DLP is using to DMD 2.085.0+ ([dd94ef465](https://github.com/dlang/dmd/commit/dd94ef465342d47a94f6c587638c49ce42f54590))
+* New formatting of locations
 
 ### `leaf-funcions`
 

source/dlp/driver/commands/leaf_functions.d

@@ -73,11 +73,9 @@ class LeafFunctions : Command!(Arguments)
 
     static void printResult(LeafFunction leafFunction)
     {
-        import std.string : fromStringz;
-        import std.stdio : writefln;
+        import std.stdio : writeln;
 
-        const location = leafFunction.location.toChars.fromStringz;
-        writefln("%s: %s", location, leafFunction.fullyQualifiedName);
+        writeln(leafFunction);
     }
 }
 
@@ -87,6 +85,14 @@ private struct LeafFunction
 
     Loc location;
     string fullyQualifiedName;
+
+    string toString() const pure
+    {
+        import std.format : format;
+        import dlp.driver.utility : toString;
+
+        return format!"%s: %s"(location.toString, fullyQualifiedName);
+    }
 }
 
 version (unittest):

source/dlp/driver/utility.d

@@ -1,5 +1,7 @@
 module dlp.driver.utility;
 
+import dmd.globals : Loc;
+
 class MissingArgumentException : Exception
 {
     this(
@@ -22,3 +24,15 @@ class MissingArgumentException : Exception
         super(msg, file, line, nextInChain);
     }
 }
+
+string toString(const ref Loc location) pure
+{
+    import std.format : format;
+    import std.string : fromStringz;
+
+    return format!"%s:%s:%s"(
+        location.filename.fromStringz,
+        location.linnum,
+        location.charnum
+    );
+}