lib/re: prevent allocating `native_match` only to free it

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/standard/re.nit b/lib/standard/re.nit
index 48142fe..a58aba0 100644 (file)
--- a/lib/standard/re.nit
+++ b/lib/standard/re.nit
@@ -180,7 +180,12 @@ class Regex
        private var native: nullable NativeRegex = null
 
        # Cache of a single `regmatch_t` to prevent many calls to `malloc`
-       private var native_match = new NativeMatchArray.malloc(native.re_nsub+1) is lazy
+       private var native_match: NativeMatchArray is lazy do
+               native_match_is_init = true
+               return new NativeMatchArray.malloc(native.re_nsub+1)
+       end
+
+       private var native_match_is_init = false
 
        # `cflags` of the last successful `compile`
        private var cflags_cache = 0
@@ -249,7 +254,10 @@ class Regex
                        native.regfree
                        native.free
                        self.native = null
-                       self.native_match.free
+
+                       if native_match_is_init then
+                               self.native_match.free
+                       end
                end
        end