Automatically enable std feature with gimli-symbolize

Author: alexcrichton

Cargo.toml

@@ -74,7 +74,7 @@ std = []
 #   splits DWARF out into a separate object file. Enabling this feature
 #   means one less C dependency.
 libbacktrace = ["backtrace-sys/backtrace-sys"]
-gimli-symbolize = ["addr2line", "object"]
+gimli-symbolize = ["addr2line", "object", "std"]
 
 #=======================================
 # Methods of serialization

src/symbolize/mod.rs

@@ -462,7 +462,6 @@ cfg_if::cfg_if! {
         use self::dbghelp::Symbol as SymbolImp;
         unsafe fn clear_symbol_cache_imp() {}
     } else if #[cfg(all(
-        feature = "std",
         feature = "gimli-symbolize",
         any(
             target_os = "linux",