Declare level type for default_metafmt (JuliaLang#37843)

Makes `@nospecialize` use precisely `LogLevel` instead of `Any`.

base/logging.jl

@@ -350,7 +350,7 @@ function logmsg_code(_module, file, line, level, message, exs...)
  let
  level = $level
  std_level = convert(LogLevel, level)
- if std_level >= getindex(_min_enabled_level)
+ if std_level >= _min_enabled_level[]
  group = $(log_data._group)
  _module = $(log_data._module)
  logger = current_logger_for_env(std_level, group, _module)
@@ -458,7 +458,7 @@ function logmsg_shim(level, message, _module, group, id, file, line, kwargs)
 end
 
 # Global log limiting mechanism for super fast but inflexible global log limiting.
-const _min_enabled_level = Ref(Debug)
+const _min_enabled_level = Ref{LogLevel}(Debug)
 
 # LogState - a cache of data extracted from the logger, plus the logger itself.
 struct LogState

stdlib/Logging/src/ConsoleLogger.jl

@@ -50,14 +50,14 @@ function showvalue(io, e::Tuple{Exception,Any})
 end
 showvalue(io, ex::Exception) = showerror(io, ex)
 
-function default_logcolor(level)
+function default_logcolor(level::LogLevel)
  level < Info ? Base.debug_color() :
  level < Warn ? Base.info_color() :
  level < Error ? Base.warn_color() :
  Base.error_color()
 end
 
-function default_metafmt(level, _module, group, id, file, line)
+function default_metafmt(level::LogLevel, _module, group, id, file, line)
  @nospecialize
  color = default_logcolor(level)
  prefix = (level == Warn ? "Warning" : string(level))*':'