fix zig fmt of c pointers

lib/std/zig/parse.zig

@@ -2558,7 +2558,7 @@ fn parsePtrTypeStart(arena: *Allocator, it: *TokenIterator, tree: *Tree) !?*Node
                 _ = try expectToken(it, tree, .RBracket);
                 const node = try arena.create(Node.PrefixOp);
                 node.* = .{
-                    .op_token = ident,
+                    .op_token = lbracket,
                     .op = .{ .PtrType = .{} },
                     .rhs = undefined, // set by caller
                 };

lib/std/zig/parser_test.zig

@@ -1,3 +1,10 @@
+test "zig fmt: c pointer type" {
+    try testCanonical(
+        \\pub extern fn repro() [*c]const u8;
+        \\
+    );
+}
+
 test "zig fmt: asm expression with comptime content" {
     try testCanonical(
         \\comptime {
@@ -21,6 +28,7 @@ test "zig fmt: asm expression with comptime content" {
         \\
     );
 }
+
 test "zig fmt: var struct field" {
     try testCanonical(
         \\pub const Pointer = struct {

lib/std/zig/render.zig

@@ -421,8 +421,10 @@ fn renderExpression(
                     const op_tok_id = tree.tokens.at(prefix_op_node.op_token).id;
                     switch (op_tok_id) {
                         .Asterisk, .AsteriskAsterisk => try stream.writeByte('*'),
-                        .Identifier => try stream.write("[*c]"),
-                        .LBracket => try stream.write("[*"),
+                        .LBracket => if (tree.tokens.at(prefix_op_node.op_token + 2).id == .Identifier)
+                            try stream.write("[*c")
+                        else
+                            try stream.write("[*"),
                         else => unreachable,
                     }
                     if (ptr_info.sentinel) |sentinel| {
@@ -435,7 +437,7 @@ fn renderExpression(
                         try renderExpression(allocator, stream, tree, indent, start_col, sentinel, sentinel_space);
                     }
                     switch (op_tok_id) {
-                        .Asterisk, .AsteriskAsterisk, .Identifier => {},
+                        .Asterisk, .AsteriskAsterisk => {},
                         .LBracket => try stream.writeByte(']'),
                         else => unreachable,
                     }