Fix field name building in type_check.lua

Port fix by @mpeterv in 5f069526966ae37319ba745644a43e0cf64ad62c

1 files changed, 5 insertions, 2 deletions

diff --git a/src/luarocks/core/type_check.lua b/src/luarocks/core/type_check.lua
index a2e14efd..1822312b 100644
--- a/src/luarocks/core/type_check.lua
+++ b/src/luarocks/core/type_check.lua
@@ -134,9 +134,12 @@ end
 
 local function mkfield(context, field)
    if context == "" then
-      return field
+      return tostring(field)
+   elseif type(field) == "string" then
+      return context.."."..field
+   else
+      return context.."["..tostring(field).."]"
    end
-   return context.."."..field
 end
 
 --- Type check the contents of a table.