std.process.Environ: fix contains function

lib/std/Io.zig

@@ -2242,5 +2242,5 @@ pub fn unlockStderr(io: Io) void {
 pub fn environ(io: Io, name: []const u8) ?[]const u8 {
     _ = io;
     _ = name;
-    if (true) @panic("TODO");
+    if (true) @panic("TODO Io.environ");
 }

lib/std/Io/Threaded.zig

@@ -12711,21 +12711,21 @@ fn scanEnviron(t: *Threaded) void {
 fn processReplace(userdata: ?*anyopaque, options: std.process.ReplaceOptions) std.process.ReplaceError {
     _ = userdata;
     _ = options;
-    @panic("TODO");
+    @panic("TODO processReplace");
 }
 
 fn processReplacePath(userdata: ?*anyopaque, dir: Dir, options: std.process.ReplaceOptions) std.process.ReplaceError {
     _ = userdata;
     _ = dir;
     _ = options;
-    @panic("TODO");
+    @panic("TODO processReplacePath");
 }
 
 fn processSpawnPath(userdata: ?*anyopaque, dir: Dir, options: process.SpawnOptions) process.SpawnError!process.Child {
     _ = userdata;
     _ = dir;
     _ = options;
-    @panic("TODO");
+    @panic("TODO processSpawnPath");
 }
 
 const processSpawn = switch (native_os) {

lib/std/process/Environ.zig

@@ -150,7 +150,7 @@ pub const Map = struct {
     }
 
     pub fn contains(m: *const Map, key: []const u8) bool {
-        return m.contains(key);
+        return m.array_hash_map.contains(key);
     }
 
     /// If there is an entry with a matching key, it is deleted from the hash
@@ -579,10 +579,11 @@ pub const CreateBlockOptions = struct {
 /// Creates a null-delimited environment variable block in the format expected
 /// by POSIX, from a different one.
 pub fn createBlock(existing: Environ, arena: Allocator, options: CreateBlockOptions) Allocator.Error![:null]?[*:0]u8 {
+    const existing_block: [*:null]const ?[*:0]const u8 = @ptrCast(existing.block);
     const existing_count, const contains_zig_progress = c: {
         var count: usize = 0;
         var contains = false;
-        while (existing.block[count]) |line| : (count += 1) {
+        while (existing_block[count]) |line| : (count += 1) {
             contains = contains or mem.eql(u8, mem.sliceTo(line, '='), "ZIG_PROGRESS");
         }
         break :c .{ count, contains };
@@ -617,7 +618,7 @@ pub fn createBlock(existing: Environ, arena: Allocator, options: CreateBlockOpti
         i += 1;
     }
 
-    while (existing.block[existing_index]) |line| : (existing_index += 1) {
+    while (existing_block[existing_index]) |line| : (existing_index += 1) {
         if (mem.eql(u8, mem.sliceTo(line, '='), "ZIG_PROGRESS")) switch (zig_progress_action) {
             .add => unreachable,
             .delete => continue,