Package.Manifest: enforce name limit of 32

src/Package/Manifest.zig

@@ -9,6 +9,7 @@ const Package = @import("../Package.zig");
 
 pub const max_bytes = 10 * 1024 * 1024;
 pub const basename = "build.zig.zon";
+pub const max_name_len = 32;
 
 pub const Dependency = struct {
     location: Location,
@@ -365,6 +366,11 @@ const Parse = struct {
             if (!std.zig.isValidId(name))
                 return fail(p, main_token, "name must be a valid bare zig identifier (hint: switch from string to enum literal)", .{});
 
+            if (name.len > max_name_len)
+                return fail(p, main_token, "name '{s}' exceeds max length of {d}", .{
+                    std.zig.fmtId(name), max_name_len,
+                });
+
             return name;
         }
 
@@ -375,6 +381,11 @@ const Parse = struct {
         if (mem.startsWith(u8, ident_name, "@"))
             return fail(p, main_token, "name must be a valid bare zig identifier", .{});
 
+        if (ident_name.len > max_name_len)
+            return fail(p, main_token, "name '{s}' exceeds max length of {d}", .{
+                std.zig.fmtId(ident_name), max_name_len,
+            });
+
         return ident_name;
     }