Temporary fix for #71. Remove when rust #48251 is fixed in stable.

Cargo.toml

@@ -18,10 +18,21 @@ default = ["builtin-lua"]
 # specialized version of lua into your binary, you can disable this feature to
 # do that, but care must be taken.  `rlua` makes at least the following
 # assumptions about the linked lua library:
-#   * LUA_INTEGER is long long
-#   * LUA_NUMBER as double
-#   * LUA_EXTRASPACE is sizeof(void*)
-#   * LUAI_MAXSTACK is 1000000
+# * LUA_INTEGER is long long
+# * LUA_NUMBER as double
+# * LUA_EXTRASPACE is sizeof(void*)
+# * LUAI_MAXSTACK is 1000000
+# * LUAI_THROW / LUAI_TRY are defined so that they are compatible with jumping
+#   over Rust stack frames.  Rust is, as of the discussion around
+#   https://github.com/rust-lang/rust/issues/48251, intended to be compatible in
+#   at least a limited way with C libraries that use setjmp / longjmp error
+#   handling, but there are some caveats.  The linked bug prevents calling into
+#   C APIs which use setjmp / longjmp handling *at all* on windows with at least
+#   the 1.24.0 version of the rust compiler, and it remains to be seen but
+#   potentially the 1.24.1 and 1.25 versions as well.  Eventually the fix for
+#   this will make it into stable rust, but until then there is a fix in the
+#   bundled version of Lua to use __intrinsic_setjmp on windows instead of
+#   setjmp to avoid unwinding and triggering rust issue #48251.
 builtin-lua = ["gcc"]
 
 [dependencies]

lua/luaconf.h

@@ -775,9 +775,15 @@
 ** without modifying the main part of the file.
 */
 
-
-
-
+/*
+** rlua modification - fix for #71, temporary until the fix for
+** https://github.com/rust-lang/rust/issues/48251 is in stable rust
+*/
+#if defined(LUA_USE_WINDOWS)
+    #define LUAI_THROW(L,c)		longjmp((c)->b, 1)
+    #define LUAI_TRY(L,c,a)		if (__intrinsic_setjmp((c)->b, NULL) == 0) { a }
+    #define luai_jmpbuf		jmp_buf
+#endif
 
 #endif