std lib: modify allocator idiom

Before we accepted a nullable allocator for some stuff like
opening files. Now we require an allocator.

Use the mem.FixedBufferAllocator pattern if a bound on the amount
to allocate is known.

This also establishes the pattern that usually an allocator is the
first argument to a function (possibly after "self").

fix docs for std.cstr.addNullByte

self hosted compiler:
 * only build docs when explicitly asked to
 * clean up main
 * stub out zig fmt

1 files changed, 1 insertions, 1 deletions

diff --git a/std/debug/index.zig b/std/debug/index.zig
index 2bb03a6706..9c27d84375 100644
--- a/std/debug/index.zig
+++ b/std/debug/index.zig
@@ -265,7 +265,7 @@ pub fn openSelfDebugInfo(allocator: &mem.Allocator) !&ElfStackTrace {
 }
 
 fn printLineFromFile(allocator: &mem.Allocator, out_stream: var, line_info: &const LineInfo) !void {
-    var f = try io.File.openRead(line_info.file_name, allocator);
+    var f = try io.File.openRead(allocator, line_info.file_name);
     defer f.close();
     // TODO fstat and make sure that the file has the correct size