From c765f5162f159a233c776e7288f68d440f81b326 Mon Sep 17 00:00:00 2001
From: Don Bright <hugh.m.bright@gmail.com>
Date: Sun, 1 Jan 2012 21:30:39 -0600
Subject: fix crash bug rpt by nop head - 'use <x.scad>' when x.scad doesnt
 exist


diff --git a/src/parser.y b/src/parser.y
index b0df50d..958ef89 100644
--- a/src/parser.y
+++ b/src/parser.y
@@ -588,13 +588,18 @@ AbstractModule *parse(const char *text, const char *path, int debug)
 	if (!module)
 		return NULL;
 
-        BOOST_FOREACH(Module::ModuleContainer::value_type &m, module->usedlibs) {
+	std::vector<std::string> to_erase;
+
+	BOOST_FOREACH(Module::ModuleContainer::value_type &m, module->usedlibs) {
 		module->usedlibs[m.first] = Module::compile_library(m.first);
 		if (!module->usedlibs[m.first]) {
 			PRINTF("WARNING: Failed to compile library `%s'.", m.first.c_str());
-			module->usedlibs.erase(m.first);
+			to_erase.push_back( m.first );
 		}
 	}
+	BOOST_FOREACH( std::string s, to_erase ) {
+		module->usedlibs.erase( s );
+	}
 
 	parser_error_pos = -1;
 	return module;
-- 
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