clang/test/Parser/cxx1z-init-statement.cpp

   1 // RUN: %clang_cc1 -std=c++1z -verify %s -Wno-vexing-parse
   2
   3 int g, h;
   4 typedef int T;
   5 int f() {
   6   // init-statement declarations
   7   if (T n = 0; n != 0) {}
   8   if (T f(); f()) {}
   9   if (T(f()); f()) {}
  10   if (T(f()), g, h; f()) {}
  11   if (T f(); f()) {}
  12   if (T f(), g, h; f()) {}
  13   if (T(n) = 0; n) {}
  14
  15   // init-statement expressions
  16   if (T{f()}; f()) {} // expected-warning {{expression result unused}}
  17   if (T{f()}, g, h; f()) {} // expected-warning 2{{left operand of comma operator has no effect}} expected-warning {{expression result unused}}
  18   if (T(f()), g, h + 1; f()) {} // expected-warning 2{{left operand of comma operator has no effect}} expected-warning {{expression result unused}}
  19
  20   // condition declarations
  21   if (T(n){g}) {}
  22   if (T f()) {} // expected-error {{function type}}
  23   if (T f(), g, h) {} // expected-error {{function type}}
  24   if (T(n) = 0) {}
  25
  26   // condition expressions
  27   if (T(f())) {}
  28   if (T{f()}) {}
  29   if (T(f()), g, h) {} // expected-warning 2{{left operand of comma operator has no effect}}
  30   if (T{f()}, g, h) {} // expected-warning 2{{left operand of comma operator has no effect}}
  31
  32   // none of the above, disambiguated as expression (can't be a declaration)
  33   if (T(n)(g)) {} // expected-error {{undeclared identifier 'n'}}
  34   if (T(n)(int())) {} // expected-error {{undeclared identifier 'n'}}
  35
  36   // Likewise for 'switch'
  37   switch (int n; n) {}
  38   switch (g; int g = 5) {} // expected-warning {{expression result unused}}
  39
  40   if (int a, b; int c = a) { // expected-note 6{{previous}}
  41     int a; // expected-error {{redefinition}}
  42     int b; // expected-error {{redefinition}}
  43     int c; // expected-error {{redefinition}}
  44   } else {
  45     int a; // expected-error {{redefinition}}
  46     int b; // expected-error {{redefinition}}
  47     int c; // expected-error {{redefinition}}
  48   }
  49
  50   return 0;
  51 }