16 files changed, 110 insertions, 46 deletions
diff --git a/src/analysis/scan/exprs/access-int.h b/src/analysis/scan/exprs/access-int.h
index 725051c..3216493 100644
--- a/src/analysis/scan/exprs/access-int.h
+++ b/src/analysis/scan/exprs/access-int.h
@@ -67,7 +67,7 @@ struct _GScanNamedAccessClass
 bool g_scan_named_access_create(GScanNamedAccess *, const sized_string_t *);
 
 /* Prépare une réduction en menant une résolution locale. */
-GRegisteredItem *_g_scan_named_access_prepare_reduction(GScanNamedAccess *, GScanContext *, GScanScope *);
+GRegisteredItem *_g_scan_named_access_prepare_reduction(const GScanNamedAccess *, GScanContext *, GScanScope *);
 
 
 
diff --git a/src/analysis/scan/exprs/access.c b/src/analysis/scan/exprs/access.c
index a8f0dc9..0df46e6 100644
--- a/src/analysis/scan/exprs/access.c
+++ b/src/analysis/scan/exprs/access.c
@@ -59,7 +59,7 @@ static void g_scan_named_access_copy(GScanNamedAccess *, const GScanNamedAccess
 
 
 /* Réduit une expression à une forme plus simple. */
-static ScanReductionState g_scan_named_access_reduce(GScanNamedAccess *, GScanContext *, GScanScope *, GScanExpression **);
+static ScanReductionState g_scan_named_access_reduce(const GScanNamedAccess *, GScanContext *, GScanScope *, GScanExpression **);
 
 
 
@@ -214,11 +214,14 @@ bool g_scan_named_access_create(GScanNamedAccess *access, const sized_string_t *
 {
     bool result;                            /* Bilan à retourner           */
 
-    result = true;
+    result = g_scan_expression_create(G_SCAN_EXPRESSION(access), SRS_PENDING);
+    if (!result) goto exit;
 
     if (target != NULL)
         access->target = strndup(target->data, target->len);
 
+ exit:
+
     return result;
 
 }
@@ -369,7 +372,7 @@ void g_scan_named_access_attach_next(GScanNamedAccess *access, GScanNamedAccess
 *                                                                             *
 ******************************************************************************/
 
-GRegisteredItem *_g_scan_named_access_prepare_reduction(GScanNamedAccess *expr, GScanContext *ctx, GScanScope *scope)
+GRegisteredItem *_g_scan_named_access_prepare_reduction(const GScanNamedAccess *expr, GScanContext *ctx, GScanScope *scope)
 {
     GRegisteredItem *result;                /* Etat synthétisé à retourner */
     GRegisteredItem *base;                  /* Base de recherche courante  */
@@ -423,7 +426,7 @@ GRegisteredItem *_g_scan_named_access_prepare_reduction(GScanNamedAccess *expr,
 *                                                                             *
 ******************************************************************************/
 
-static ScanReductionState g_scan_named_access_reduce(GScanNamedAccess *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
+static ScanReductionState g_scan_named_access_reduce(const GScanNamedAccess *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
 {
     ScanReductionState result;              /* Etat synthétisé à retourner */
     GRegisteredItem *resolved;              /* Cible concrète obtenue      */
diff --git a/src/analysis/scan/exprs/arithmetic.c b/src/analysis/scan/exprs/arithmetic.c
index 0c01d2a..06cfc48 100644
--- a/src/analysis/scan/exprs/arithmetic.c
+++ b/src/analysis/scan/exprs/arithmetic.c
@@ -56,7 +56,7 @@ static void g_scan_arithmetic_operation_finalize(GScanArithmeticOperation *);
 static bool g_scan_arithmetic_operation_compare_rich(const GScanArithmeticOperation *, const GScanArithmeticOperation *, RichCmpOperation, bool *);
 
 /* Réduit une expression à une forme plus simple. */
-static ScanReductionState g_scan_arithmetic_operation_reduce(GScanArithmeticOperation *, GScanContext *, GScanScope *, GScanExpression **);
+static ScanReductionState g_scan_arithmetic_operation_reduce(const GScanArithmeticOperation *, GScanContext *, GScanScope *, GScanExpression **);
 
 
 
@@ -207,7 +207,8 @@ bool g_scan_arithmetic_operation_create(GScanArithmeticOperation *op, Arithmetic
 {
     bool result;                            /* Bilan à retourner           */
 
-    result = true;
+    result = g_scan_expression_create(G_SCAN_EXPRESSION(op), SRS_PENDING);
+    if (!result) goto exit;
 
     op->operator = operator;
 
@@ -217,6 +218,8 @@ bool g_scan_arithmetic_operation_create(GScanArithmeticOperation *op, Arithmetic
     op->right = right;
     g_object_ref(G_OBJECT(op->right));
 
+ exit:
+
     return result;
 
 }
@@ -290,7 +293,7 @@ static bool g_scan_arithmetic_operation_compare_rich(const GScanArithmeticOperat
 *                                                                             *
 ******************************************************************************/
 
-static ScanReductionState g_scan_arithmetic_operation_reduce(GScanArithmeticOperation *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
+static ScanReductionState g_scan_arithmetic_operation_reduce(const GScanArithmeticOperation *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
 {
     ScanReductionState result;              /* Etat synthétisé à retourner */
     GScanExpression *new_left;              /* Expression réduite (gauche) */
diff --git a/src/analysis/scan/exprs/call.c b/src/analysis/scan/exprs/call.c
index 83aff85..d9b2c13 100644
--- a/src/analysis/scan/exprs/call.c
+++ b/src/analysis/scan/exprs/call.c
@@ -55,7 +55,7 @@ static void g_scan_pending_call_finalize(GScanPendingCall *);
 
 
 /* Réduit une expression à une forme plus simple. */
-static ScanReductionState g_scan_pending_call_reduce(GScanPendingCall *, GScanContext *, GScanScope *, GScanExpression **);
+static ScanReductionState g_scan_pending_call_reduce(const GScanPendingCall *, GScanContext *, GScanScope *, GScanExpression **);
 
 /* Reproduit un accès en place dans une nouvelle instance. */
 static void g_scan_pending_call_copy(GScanPendingCall *, const GScanPendingCall *);
@@ -260,7 +260,7 @@ bool g_scan_pending_call_create(GScanPendingCall *call, const sized_string_t *ta
 *                                                                             *
 ******************************************************************************/
 
-static ScanReductionState g_scan_pending_call_reduce(GScanPendingCall *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
+static ScanReductionState g_scan_pending_call_reduce(const GScanPendingCall *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
 {
     ScanReductionState result;              /* Etat synthétisé à retourner */
     GScanNamedAccess *access;               /* Autre vision de l'expression*/
diff --git a/src/analysis/scan/exprs/counter.c b/src/analysis/scan/exprs/counter.c
index bb4e523..7fadb91 100644
--- a/src/analysis/scan/exprs/counter.c
+++ b/src/analysis/scan/exprs/counter.c
@@ -50,7 +50,7 @@ static void g_scan_match_counter_finalize(GScanMatchCounter *);
 
 
 /* Réduit une expression à une forme plus simple. */
-static ScanReductionState g_scan_match_counter_reduce(GScanMatchCounter *, GScanContext *, GScanScope *, GScanExpression **);
+static ScanReductionState g_scan_match_counter_reduce(const GScanMatchCounter *, GScanContext *, GScanScope *, GScanExpression **);
 
 
 
@@ -195,11 +195,14 @@ bool g_scan_match_counter_create(GScanMatchCounter *counter, GSearchPattern *pat
 {
     bool result;                            /* Bilan à retourner           */
 
-    result = true;
+    result = g_scan_expression_create(G_SCAN_EXPRESSION(counter), SRS_WAIT_FOR_SCAN);
+    if (!result) goto exit;
 
     counter->pattern = pattern;
     g_object_ref(G_OBJECT(pattern));
 
+ exit:
+
     return result;
 
 }
@@ -226,7 +229,7 @@ bool g_scan_match_counter_create(GScanMatchCounter *counter, GSearchPattern *pat
 *                                                                             *
 ******************************************************************************/
 
-static ScanReductionState g_scan_match_counter_reduce(GScanMatchCounter *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
+static ScanReductionState g_scan_match_counter_reduce(const GScanMatchCounter *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
 {
     ScanReductionState result;              /* Etat synthétisé à retourner */
     size_t count;                           /* Quantité de correspondances */
diff --git a/src/analysis/scan/exprs/handler.c b/src/analysis/scan/exprs/handler.c
index a14140a..1676522 100644
--- a/src/analysis/scan/exprs/handler.c
+++ b/src/analysis/scan/exprs/handler.c
@@ -54,10 +54,10 @@ static void g_scan_pattern_handler_finalize(GScanPatternHandler *);
 
 
 /* Réduit une expression à une forme plus simple. */
-static ScanReductionState g_scan_pattern_handler_reduce(GScanPatternHandler *, GScanContext *, GScanScope *, GScanExpression **);
+static ScanReductionState g_scan_pattern_handler_reduce(const GScanPatternHandler *, GScanContext *, GScanScope *, GScanExpression **);
 
 /* Réduit une expression à une forme booléenne. */
-static bool g_scan_pattern_handler_reduce_to_boolean(GScanPatternHandler *, GScanContext *, GScanScope *, GScanExpression **);
+static bool g_scan_pattern_handler_reduce_to_boolean(const GScanPatternHandler *, GScanContext *, GScanScope *, GScanExpression **);
 
 /* Dénombre les éléments portés par une expression. */
 static bool g_scan_pattern_handler_count_items(const GScanPatternHandler *, GScanContext *, size_t *);
@@ -213,13 +213,16 @@ bool g_scan_pattern_handler_create(GScanPatternHandler *handler, GSearchPattern
 {
     bool result;                            /* Bilan à retourner           */
 
-    result = true;
+    result = g_scan_expression_create(G_SCAN_EXPRESSION(handler), SRS_WAIT_FOR_SCAN);
+    if (!result) goto exit;
 
     handler->pattern = pattern;
     g_object_ref(G_OBJECT(pattern));
 
     handler->type = type;
 
+ exit:
+
     return result;
 
 }
@@ -246,7 +249,7 @@ bool g_scan_pattern_handler_create(GScanPatternHandler *handler, GSearchPattern
 *                                                                             *
 ******************************************************************************/
 
-static ScanReductionState g_scan_pattern_handler_reduce(GScanPatternHandler *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
+static ScanReductionState g_scan_pattern_handler_reduce(const GScanPatternHandler *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
 {
     ScanReductionState result;              /* Etat synthétisé à retourner */
 
@@ -276,7 +279,7 @@ static ScanReductionState g_scan_pattern_handler_reduce(GScanPatternHandler *exp
 *                                                                             *
 ******************************************************************************/
 
-static bool g_scan_pattern_handler_reduce_to_boolean(GScanPatternHandler *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
+static bool g_scan_pattern_handler_reduce_to_boolean(const GScanPatternHandler *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
 {
     bool result;                            /* Bilan à retourner           */
     size_t count;                           /* Quantité de correspondances */
diff --git a/src/analysis/scan/exprs/intersect.c b/src/analysis/scan/exprs/intersect.c
index f0660e0..c56d28c 100644
--- a/src/analysis/scan/exprs/intersect.c
+++ b/src/analysis/scan/exprs/intersect.c
@@ -53,7 +53,7 @@ static void g_scan_sets_intersection_finalize(GScanSetsIntersection *);
 
 
 /* Réduit une expression à une forme plus simple. */
-static ScanReductionState g_scan_sets_intersection_reduce(GScanSetsIntersection *, GScanContext *, GScanScope *, GScanExpression **);
+static ScanReductionState g_scan_sets_intersection_reduce(const GScanSetsIntersection *, GScanContext *, GScanScope *, GScanExpression **);
 
 
 
@@ -236,7 +236,7 @@ bool g_scan_sets_intersection_create(GScanSetsIntersection *inter, GScanExpressi
 *                                                                             *
 ******************************************************************************/
 
-static ScanReductionState g_scan_sets_intersection_reduce(GScanSetsIntersection *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
+static ScanReductionState g_scan_sets_intersection_reduce(const GScanSetsIntersection *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
 {
     ScanReductionState result;              /* Etat synthétisé à retourner */
     GScanExpression *new_first;             /* Nouvelle réduction #1       */
diff --git a/src/analysis/scan/exprs/item.c b/src/analysis/scan/exprs/item.c
index a6b22f0..b7cd970 100644
--- a/src/analysis/scan/exprs/item.c
+++ b/src/analysis/scan/exprs/item.c
@@ -53,7 +53,7 @@ static void g_scan_set_item_finalize(GScanSetItem *);
 
 
 /* Réduit une expression à une forme plus simple. */
-static ScanReductionState g_scan_set_item_reduce(GScanSetItem *, GScanContext *, GScanScope *, GScanExpression **);
+static ScanReductionState g_scan_set_item_reduce(const GScanSetItem *, GScanContext *, GScanScope *, GScanExpression **);
 
 
 
@@ -201,7 +201,8 @@ bool g_scan_set_item_create(GScanSetItem *item, GScanExpression *set, GScanExpre
 {
     bool result;                            /* Bilan à retourner           */
 
-    result = true;
+    result = g_scan_expression_create(G_SCAN_EXPRESSION(item), SRS_PENDING);
+    if (!result) goto exit;
 
     item->set = set;
     g_object_ref(G_OBJECT(set));
@@ -209,6 +210,8 @@ bool g_scan_set_item_create(GScanSetItem *item, GScanExpression *set, GScanExpre
     item->index = index;
     g_object_ref(G_OBJECT(index));
 
+ exit:
+
     return result;
 
 }
@@ -235,7 +238,7 @@ bool g_scan_set_item_create(GScanSetItem *item, GScanExpression *set, GScanExpre
 *                                                                             *
 ******************************************************************************/
 
-static ScanReductionState g_scan_set_item_reduce(GScanSetItem *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
+static ScanReductionState g_scan_set_item_reduce(const GScanSetItem *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
 {
     ScanReductionState result;              /* Etat synthétisé à retourner */
     GScanExpression *new_set;               /* Expression réduite (série) */
diff --git a/src/analysis/scan/exprs/literal.c b/src/analysis/scan/exprs/literal.c
index 070c177..de7e32a 100644
--- a/src/analysis/scan/exprs/literal.c
+++ b/src/analysis/scan/exprs/literal.c
@@ -57,7 +57,7 @@ static void g_scan_literal_expression_finalize(GScanLiteralExpression *);
 static bool g_scan_literal_expression_compare_rich(const GScanLiteralExpression *, const GScanLiteralExpression *, RichCmpOperation, bool *);
 
 /* Réduit une expression à une forme booléenne. */
-static bool g_scan_literal_expression_reduce_to_boolean(GScanLiteralExpression *, GScanContext *, GScanScope *, GScanExpression **);
+static bool g_scan_literal_expression_reduce_to_boolean(const GScanLiteralExpression *, GScanContext *, GScanScope *, GScanExpression **);
 
 /* Dénombre les éléments portés par une expression. */
 static bool g_scan_literal_expression_count(const GScanLiteralExpression *, GScanContext *, size_t *);
@@ -225,6 +225,9 @@ bool g_scan_literal_expression_create(GScanLiteralExpression *expr, LiteralValue
     char *tmp;                              /* Zone de travail temporaire  */
     int ret;                                /* Bilan d'une opération       */
 
+    result = g_scan_expression_create(G_SCAN_EXPRESSION(expr), SRS_REDUCED);
+    if (!result) goto exit;
+
     va_start(ap, vtype);
 
     switch (vtype)
@@ -312,6 +315,8 @@ bool g_scan_literal_expression_create(GScanLiteralExpression *expr, LiteralValue
 
     expr->value_type = vtype;
 
+ exit:
+
     return result;
 
 }
@@ -582,7 +587,7 @@ static bool g_scan_literal_expression_compare_rich(const GScanLiteralExpression
 *                                                                             *
 ******************************************************************************/
 
-static bool g_scan_literal_expression_reduce_to_boolean(GScanLiteralExpression *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
+static bool g_scan_literal_expression_reduce_to_boolean(const GScanLiteralExpression *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
 {
     bool result;                            /* Bilan à retourner           */
 
diff --git a/src/analysis/scan/exprs/logical.c b/src/analysis/scan/exprs/logical.c
index 4c82b1e..cc78a75 100644
--- a/src/analysis/scan/exprs/logical.c
+++ b/src/analysis/scan/exprs/logical.c
@@ -56,7 +56,7 @@ static void g_scan_logical_operation_finalize(GScanLogicalOperation *);
 static bool g_scan_logical_operation_compare_rich(const GScanLogicalOperation *, const GScanLogicalOperation *, RichCmpOperation, bool *);
 
 /* Réduit une expression à une forme plus simple. */
-static ScanReductionState g_scan_logical_operation_reduce(GScanLogicalOperation *, GScanContext *, GScanScope *, GScanExpression **);
+static ScanReductionState g_scan_logical_operation_reduce(const GScanLogicalOperation *, GScanContext *, GScanScope *, GScanExpression **);
 
 
 
@@ -207,6 +207,9 @@ bool g_scan_logical_operation_create(GScanLogicalOperation *op, BooleanOperation
 {
     bool result;                            /* Bilan à retourner           */
 
+    result = g_scan_expression_create(G_SCAN_EXPRESSION(op), SRS_PENDING);
+    if (!result) goto exit;
+
     op->type = type;
 
     switch (type)
@@ -236,6 +239,8 @@ bool g_scan_logical_operation_create(GScanLogicalOperation *op, BooleanOperation
 
     }
 
+ exit:
+
     return result;
 
 }
@@ -332,7 +337,7 @@ static bool g_scan_logical_operation_compare_rich(const GScanLogicalOperation *i
 *                                                                             *
 ******************************************************************************/
 
-static ScanReductionState g_scan_logical_operation_reduce(GScanLogicalOperation *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
+static ScanReductionState g_scan_logical_operation_reduce(const GScanLogicalOperation *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
 {
     ScanReductionState result;              /* Etat synthétisé à retourner */
     GScanExpression *new_first;             /* Expression réduite (gauche) */
diff --git a/src/analysis/scan/exprs/range.c b/src/analysis/scan/exprs/range.c
index f97b15e..9716149 100644
--- a/src/analysis/scan/exprs/range.c
+++ b/src/analysis/scan/exprs/range.c
@@ -50,13 +50,13 @@ static void g_scan_compact_range_finalize(GScanCompactRange *);
 
 
 /* Réduit une expression à une forme plus simple. */
-static ScanReductionState g_scan_compact_range_reduce(GScanCompactRange *, GScanContext *, GScanScope *, GScanExpression **);
+static ScanReductionState g_scan_compact_range_reduce(const GScanCompactRange *, GScanContext *, GScanScope *, GScanExpression **);
 
 /* Réduit une expression à une forme booléenne. */
-static bool g_scan_compact_range_reduce_to_boolean(GScanCompactRange *, GScanContext *, GScanScope *, GScanExpression **);
+static bool g_scan_compact_range_reduce_to_boolean(const GScanCompactRange *, GScanContext *, GScanScope *, GScanExpression **);
 
 /* Réalise l'intersection entre deux ensembles. */
-static GScanExpression *g_scan_compact_range_intersect(GScanCompactRange *expr, const GScanExpression *, GScanContext *, GScanScope *);
+static GScanExpression *g_scan_compact_range_intersect(const GScanCompactRange *expr, const GScanExpression *, GScanContext *, GScanScope *);
 
 
 
@@ -206,7 +206,8 @@ bool g_scan_compact_range_create(GScanCompactRange *range, GScanExpression *star
 {
     bool result;                            /* Bilan à retourner           */
 
-    result = true;
+    result = g_scan_expression_create(G_SCAN_EXPRESSION(range), SRS_PENDING);
+    if (!result) goto exit;
 
     range->start = start;
     g_object_ref(G_OBJECT(start));
@@ -214,6 +215,8 @@ bool g_scan_compact_range_create(GScanCompactRange *range, GScanExpression *star
     range->end = end;
     g_object_ref(G_OBJECT(end));
 
+ exit:
+
     return result;
 
 }
@@ -240,7 +243,7 @@ bool g_scan_compact_range_create(GScanCompactRange *range, GScanExpression *star
 *                                                                             *
 ******************************************************************************/
 
-static ScanReductionState g_scan_compact_range_reduce(GScanCompactRange *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
+static ScanReductionState g_scan_compact_range_reduce(const GScanCompactRange *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
 {
     ScanReductionState result;              /* Etat synthétisé à retourner */
     GScanExpression *new_start;             /* Nouvelle réduction #1       */
@@ -298,7 +301,7 @@ static ScanReductionState g_scan_compact_range_reduce(GScanCompactRange *expr, G
 *                                                                             *
 ******************************************************************************/
 
-static bool g_scan_compact_range_reduce_to_boolean(GScanCompactRange *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
+static bool g_scan_compact_range_reduce_to_boolean(const GScanCompactRange *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
 {
     bool result;                            /* Bilan à retourner           */
     bool status;                            /* Bilan d'une comparaison     */
@@ -335,7 +338,7 @@ static bool g_scan_compact_range_reduce_to_boolean(GScanCompactRange *expr, GSca
 *                                                                             *
 ******************************************************************************/
 
-static GScanExpression *g_scan_compact_range_intersect(GScanCompactRange *expr, const GScanExpression *other, GScanContext *ctx, GScanScope *scope)
+static GScanExpression *g_scan_compact_range_intersect(const GScanCompactRange *expr, const GScanExpression *other, GScanContext *ctx, GScanScope *scope)
 {
     GScanExpression *result;                /* Instance à retourner        */
 
diff --git a/src/analysis/scan/exprs/relational.c b/src/analysis/scan/exprs/relational.c
index b56b599..74a972b 100644
--- a/src/analysis/scan/exprs/relational.c
+++ b/src/analysis/scan/exprs/relational.c
@@ -56,7 +56,7 @@ static void g_scan_relational_operation_finalize(GScanRelationalOperation *);
 static bool g_scan_relational_operation_compare_rich(const GScanRelationalOperation *, const GScanRelationalOperation *, RichCmpOperation, bool *);
 
 /* Réduit une expression à une forme plus simple. */
-static ScanReductionState g_scan_relational_operation_reduce(GScanRelationalOperation *, GScanContext *, GScanScope *, GScanExpression **);
+static ScanReductionState g_scan_relational_operation_reduce(const GScanRelationalOperation *, GScanContext *, GScanScope *, GScanExpression **);
 
 
 
@@ -207,7 +207,8 @@ bool g_scan_relational_operation_create(GScanRelationalOperation *op, RichCmpOpe
 {
     bool result;                            /* Bilan à retourner           */
 
-    result = true;
+    result = g_scan_expression_create(G_SCAN_EXPRESSION(op), SRS_PENDING);
+    if (!result) goto exit;
 
     op->rel_type = type;
 
@@ -217,6 +218,8 @@ bool g_scan_relational_operation_create(GScanRelationalOperation *op, RichCmpOpe
     op->right = right;
     g_object_ref(G_OBJECT(op->right));
 
+ exit:
+
     return result;
 
 }
@@ -290,7 +293,7 @@ static bool g_scan_relational_operation_compare_rich(const GScanRelationalOperat
 *                                                                             *
 ******************************************************************************/
 
-static ScanReductionState g_scan_relational_operation_reduce(GScanRelationalOperation *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
+static ScanReductionState g_scan_relational_operation_reduce(const GScanRelationalOperation *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
 {
     ScanReductionState result;              /* Etat synthétisé à retourner */
     GScanExpression *new_left;              /* Expression réduite (gauche) */
diff --git a/src/analysis/scan/exprs/set-int.h b/src/analysis/scan/exprs/set-int.h
index ebb4380..10ca8d0 100644
--- a/src/analysis/scan/exprs/set-int.h
+++ b/src/analysis/scan/exprs/set-int.h
@@ -50,5 +50,9 @@ struct _GScanGenericSetClass
 };
 
 
+/* Met en place un ensemble d'éléments homogènes ou hétérogènes. */
+bool g_scan_generic_set_create(GScanGenericSet *);
+
+
 
 #endif  /* _ANALYSIS_SCAN_EXPRS_SET_INT_H */
diff --git a/src/analysis/scan/exprs/set.c b/src/analysis/scan/exprs/set.c
index d76af4d..438e7e3 100644
--- a/src/analysis/scan/exprs/set.c
+++ b/src/analysis/scan/exprs/set.c
@@ -54,10 +54,10 @@ static void g_scan_generic_set_finalize(GScanGenericSet *);
 
 
 /* Réduit une expression à une forme plus simple. */
-static ScanReductionState g_scan_generic_set_reduce(GScanGenericSet *, GScanContext *, GScanScope *, GScanExpression **);
+static ScanReductionState g_scan_generic_set_reduce(const GScanGenericSet *, GScanContext *, GScanScope *, GScanExpression **);
 
 /* Réduit une expression à une forme booléenne. */
-static bool g_scan_generic_set_reduce_to_boolean(GScanGenericSet *, GScanContext *, GScanScope *, GScanExpression **);
+static bool g_scan_generic_set_reduce_to_boolean(const GScanGenericSet *, GScanContext *, GScanScope *, GScanExpression **);
 
 /* Dénombre les éléments portés par une expression. */
 static bool g_scan_generic_set_count_items(const GScanGenericSet *, GScanContext *, size_t *);
@@ -178,7 +178,7 @@ static void g_scan_generic_set_finalize(GScanGenericSet *set)
 *                                                                             *
 *  Paramètres  : -                                                            *
 *                                                                             *
-*  Description : Met en place un ensemble d'éléments homogènes ou hétérogènes.*
+*  Description : Constitue un ensemble d'éléments homogènes ou hétérogènes.   *
 *                                                                             *
 *  Retour      : Expression mise en place.                                    *
 *                                                                             *
@@ -192,6 +192,32 @@ GScanExpression *g_scan_generic_set_new(void)
 
     result = g_object_new(G_TYPE_SCAN_GENERIC_SET, NULL);
 
+    if (!g_scan_generic_set_create(G_SCAN_GENERIC_SET(result)))
+        g_clear_object(&result);
+
+    return result;
+
+}
+
+
+/******************************************************************************
+*                                                                             *
+*  Paramètres  : set = instance à initialiser pleinement.                     *
+*                                                                             *
+*  Description : Met en place un ensemble d'éléments homogènes ou hétérogènes.*
+*                                                                             *
+*  Retour      : Bilan de l'opération.                                        *
+*                                                                             *
+*  Remarques   : -                                                            *
+*                                                                             *
+******************************************************************************/
+
+bool g_scan_generic_set_create(GScanGenericSet *set)
+{
+    bool result;                            /* Bilan à retourner           */
+
+    result = g_scan_expression_create(G_SCAN_EXPRESSION(set), SRS_PENDING);
+
     return result;
 
 }
@@ -241,7 +267,7 @@ void g_scan_generic_set_add_item(GScanGenericSet *set, GScanExpression *item)
 *                                                                             *
 ******************************************************************************/
 
-static ScanReductionState g_scan_generic_set_reduce(GScanGenericSet *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
+static ScanReductionState g_scan_generic_set_reduce(const GScanGenericSet *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
 {
     ScanReductionState result;              /* Etat synthétisé à retourner */
     size_t i;                               /* Boucle de parcours #1       */
@@ -312,7 +338,7 @@ static ScanReductionState g_scan_generic_set_reduce(GScanGenericSet *expr, GScan
 *                                                                             *
 ******************************************************************************/
 
-static bool g_scan_generic_set_reduce_to_boolean(GScanGenericSet *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
+static bool g_scan_generic_set_reduce_to_boolean(const GScanGenericSet *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
 {
     bool result;                            /* Bilan à retourner           */
 
diff --git a/src/analysis/scan/exprs/set.h b/src/analysis/scan/exprs/set.h
index f857ce9..c9fb3b3 100644
--- a/src/analysis/scan/exprs/set.h
+++ b/src/analysis/scan/exprs/set.h
@@ -47,7 +47,7 @@ typedef struct _GScanGenericSetClass GScanGenericSetClass;
 /* Indique le type défini pour une base d'ensembles d'éléments homogènes ou hétérogènes. */
 GType g_scan_generic_set_get_type(void);
 
-/* Met en place un ensemble d'éléments homogènes ou hétérogènes. */
+/* Constitue un ensemble d'éléments homogènes ou hétérogènes. */
 GScanExpression *g_scan_generic_set_new(void);
 
 /* Ajoute un nouvel élément à un ensemble. */
diff --git a/src/analysis/scan/exprs/strop.c b/src/analysis/scan/exprs/strop.c
index c7c2878..c188c36 100644
--- a/src/analysis/scan/exprs/strop.c
+++ b/src/analysis/scan/exprs/strop.c
@@ -55,7 +55,7 @@ static void g_scan_string_operation_finalize(GScanStringOperation *);
 
 
 /* Réduit une expression à une forme plus simple. */
-static ScanReductionState g_scan_string_operation_reduce(GScanStringOperation *, GScanContext *, GScanScope *, GScanExpression **);
+static ScanReductionState g_scan_string_operation_reduce(const GScanStringOperation *, GScanContext *, GScanScope *, GScanExpression **);
 
 
 
@@ -208,7 +208,8 @@ bool g_scan_string_operation_create(GScanStringOperation *op, StringOperationTyp
 {
     bool result;                            /* Bilan à retourner           */
 
-    result = true;
+    result = g_scan_expression_create(G_SCAN_EXPRESSION(op), SRS_PENDING);
+    if (!result) goto exit;
 
     op->type = type;
 
@@ -236,6 +237,8 @@ bool g_scan_string_operation_create(GScanStringOperation *op, StringOperationTyp
     op->right = right;
     g_object_ref(G_OBJECT(op->right));
 
+ exit:
+
     return result;
 
 }
@@ -262,7 +265,7 @@ bool g_scan_string_operation_create(GScanStringOperation *op, StringOperationTyp
 *                                                                             *
 ******************************************************************************/
 
-static ScanReductionState g_scan_string_operation_reduce(GScanStringOperation *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
+static ScanReductionState g_scan_string_operation_reduce(const GScanStringOperation *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out)
 {
     ScanReductionState result;              /* Etat synthétisé à retourner */
     GScanExpression *new_left;              /* Expression réduite (gauche) */