From cd211bcc20d3d1ddd1a50d57c7645aa3445934f0 Mon Sep 17 00:00:00 2001
From: Wink Saville <wink@saville.com>
Date: Mon, 1 Oct 2018 21:51:53 -0700
Subject: [PATCH] Add doc comment for tokenLocationPtr (#1618)

The algorithm seemed unusual and I had spent some effort understanding
it, so I thought I'd add a comment.
---
 std/zig/ast.zig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/std/zig/ast.zig b/std/zig/ast.zig
index 2102da456c..e2ac5f6341 100644
--- a/std/zig/ast.zig
+++ b/std/zig/ast.zig
@@ -45,6 +45,7 @@ pub const Tree = struct {
         line_end: usize,
     };
 
+    /// Return the Location of the token relative to the offset specified by `start_index`.
     pub fn tokenLocationPtr(self: *Tree, start_index: usize, token: *const Token) Location {
         var loc = Location{
             .line = 0,