Add testcase for nested C struct name conflict

Issue #1305

CHANGES.current

@@ -7,6 +7,10 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
 Version 4.0.0 (in progress)
 ===========================
 
+2018-08-20: wkalinin
+            #1305 Fix nested structure symbol tables in C mode to fix member name conflicts
+            in different structs with the same nested struct member name.
+
 2018-08-12: gmazzamuto
             [Python] #1283 Update pybuffer.i library to use new-style Python buffer C API.
 

Examples/test-suite/nested.i

@@ -114,4 +114,50 @@ typedef struct OutSt {
 
 #endif
 
+%inline %{
+  typedef struct {
+    union x_union {
+      int x;
+    } duplicate_p;
+  } x_t;
+
+  typedef struct {
+    union y_union {
+      int y;
+    } duplicate_p;
+  } y_t;
+
+  typedef struct A {
+    union a_union {
+      int a;
+    } duplicate_p;
+  } a_t;
+
+  typedef struct B {
+    union b_union {
+      int b;
+    } duplicate_p;
+  } b_t;
+
+  typedef struct {
+    union {
+      int c;
+    } duplicate_p;
+  } c_t;
+
+  typedef struct {
+    union {
+      int d;
+    } duplicate_p;
+  } d_t;
+
+  void set_union_values(int startval, x_t *x, y_t *y, a_t *a, b_t *b, c_t *c, d_t *d) {
+    x->duplicate_p.x = startval++;
+    y->duplicate_p.y = startval++;
+    a->duplicate_p.a = startval++;
+    b->duplicate_p.b = startval++;
+    c->duplicate_p.c = startval++;
+    d->duplicate_p.d = startval++;
+  }
+%}
 

Examples/test-suite/python/nested_runme.py

@@ -0,0 +1,20 @@
+from nested import *
+
+def check(a, b):
+    if a != b:
+        raise RuntimeError("Problem: {} != {}".format(a, b))
+xx = x_t()
+yy = y_t()
+aa = a_t()
+bb = b_t()
+cc = c_t()
+dd = d_t()
+
+set_union_values(100, xx, yy, aa, bb, cc, dd)
+
+check(xx.duplicate_p.x, 100)
+check(yy.duplicate_p.y, 101)
+check(aa.duplicate_p.a, 102)
+check(bb.duplicate_p.b, 103)
+check(cc.duplicate_p.c, 104)
+check(dd.duplicate_p.d, 105)