Fix code gen for operator= with single-statement body

Encapsulate `current_functions` for lifetime safety... otherwise nested functions can invalidate epilog references before we can use them

Author: hsutter

regression-tests/test-results/clang-12/mixed-float-literals.cpp.output

@@ -164,78 +164,54 @@ mixed-float-literals.cpp2:74:3: warning: expression result unused [-Wunused-valu
   123'456.0f;
   ^~~~~~~~~~
 mixed-float-literals.cpp2:75:3: warning: expression result unused [-Wunused-value]
-  123'456.f;
-  ^~~~~~~~~
-mixed-float-literals.cpp2:76:3: warning: expression result unused [-Wunused-value]
   456.0;
   ^~~~~
-mixed-float-literals.cpp2:77:3: warning: expression result unused [-Wunused-value]
-  456.;
-  ^~~~
-mixed-float-literals.cpp2:78:3: warning: expression result unused [-Wunused-value]
+mixed-float-literals.cpp2:76:3: warning: expression result unused [-Wunused-value]
   1.0e10;
   ^~~~~~
-mixed-float-literals.cpp2:79:3: warning: expression result unused [-Wunused-value]
+mixed-float-literals.cpp2:77:3: warning: expression result unused [-Wunused-value]
   1.0e+10;
   ^~~~~~~
-mixed-float-literals.cpp2:80:3: warning: expression result unused [-Wunused-value]
+mixed-float-literals.cpp2:78:3: warning: expression result unused [-Wunused-value]
   1.0e-10;
   ^~~~~~~
-mixed-float-literals.cpp2:81:3: warning: expression result unused [-Wunused-value]
+mixed-float-literals.cpp2:79:3: warning: expression result unused [-Wunused-value]
   1.0e-10f;
   ^~~~~~~~
-mixed-float-literals.cpp2:82:3: warning: expression result unused [-Wunused-value]
-  1.e-10;
-  ^~~~~~
-mixed-float-literals.cpp2:83:3: warning: expression result unused [-Wunused-value]
-  1.e-10f;
-  ^~~~~~~
-mixed-float-literals.cpp2:84:3: warning: expression result unused [-Wunused-value]
+mixed-float-literals.cpp2:80:3: warning: expression result unused [-Wunused-value]
   1e-10;
   ^~~~~
-mixed-float-literals.cpp2:85:3: warning: expression result unused [-Wunused-value]
+mixed-float-literals.cpp2:81:3: warning: expression result unused [-Wunused-value]
   1e-10f;
   ^~~~~~
-mixed-float-literals.cpp2:86:3: warning: expression result unused [-Wunused-value]
+mixed-float-literals.cpp2:82:3: warning: expression result unused [-Wunused-value]
   1e-1'0;
   ^~~~~~
-mixed-float-literals.cpp2:87:3: warning: expression result unused [-Wunused-value]
+mixed-float-literals.cpp2:83:3: warning: expression result unused [-Wunused-value]
   123'456.0F;
   ^~~~~~~~~~
-mixed-float-literals.cpp2:88:3: warning: expression result unused [-Wunused-value]
-  123'456.F;
-  ^~~~~~~~~
-mixed-float-literals.cpp2:89:3: warning: expression result unused [-Wunused-value]
+mixed-float-literals.cpp2:84:3: warning: expression result unused [-Wunused-value]
   456.0;
   ^~~~~
-mixed-float-literals.cpp2:90:3: warning: expression result unused [-Wunused-value]
-  456.;
-  ^~~~
-mixed-float-literals.cpp2:91:3: warning: expression result unused [-Wunused-value]
+mixed-float-literals.cpp2:85:3: warning: expression result unused [-Wunused-value]
   1.0E10;
   ^~~~~~
-mixed-float-literals.cpp2:92:3: warning: expression result unused [-Wunused-value]
+mixed-float-literals.cpp2:86:3: warning: expression result unused [-Wunused-value]
   1.0E+10;
   ^~~~~~~
-mixed-float-literals.cpp2:93:3: warning: expression result unused [-Wunused-value]
+mixed-float-literals.cpp2:87:3: warning: expression result unused [-Wunused-value]
   1.0E-10;
   ^~~~~~~
-mixed-float-literals.cpp2:94:3: warning: expression result unused [-Wunused-value]
+mixed-float-literals.cpp2:88:3: warning: expression result unused [-Wunused-value]
   1.0E-10F;
   ^~~~~~~~
-mixed-float-literals.cpp2:95:3: warning: expression result unused [-Wunused-value]
-  1.E-10;
-  ^~~~~~
-mixed-float-literals.cpp2:96:3: warning: expression result unused [-Wunused-value]
-  1.E-10F;
-  ^~~~~~~
-mixed-float-literals.cpp2:97:3: warning: expression result unused [-Wunused-value]
+mixed-float-literals.cpp2:89:3: warning: expression result unused [-Wunused-value]
   1E-10;
   ^~~~~
-mixed-float-literals.cpp2:98:3: warning: expression result unused [-Wunused-value]
+mixed-float-literals.cpp2:90:3: warning: expression result unused [-Wunused-value]
   1E-10F;
   ^~~~~~
-mixed-float-literals.cpp2:99:3: warning: expression result unused [-Wunused-value]
+mixed-float-literals.cpp2:91:3: warning: expression result unused [-Wunused-value]
   1E-1'0;
   ^~~~~~
-80 warnings generated.
+72 warnings generated.

regression-tests/test-results/mixed-multiple-return-values.cpp

@@ -55,5 +55,5 @@ bool flip_a_coin() {
 }
 
 auto print(cpp2::in<std::string> name, auto const& value) -> void { 
-      std::cout << name << " is " << value << "\n"; }
+    std::cout << name << " is " << value << "\n"; }
 

regression-tests/test-results/pure2-types-smf-and-that-1-provide-everything.cpp

@@ -74,7 +74,7 @@ class myclass   {
         cpp2::in<std::string_view> prefix, 
         cpp2::in<std::string_view> suffix
         ) const -> void { 
-      std::cout << prefix << "[ " + cpp2::to_string(name) + " | " + cpp2::to_string(addr) + " ]" << suffix; }
+    std::cout << prefix << "[ " + cpp2::to_string(name) + " | " + cpp2::to_string(addr) + " ]" << suffix; }
 
 };
 

regression-tests/test-results/pure2-types-smf-and-that-2-provide-mvconstruct-and-cpassign.cpp

@@ -79,7 +79,7 @@ class myclass   {
         cpp2::in<std::string_view> prefix, 
         cpp2::in<std::string_view> suffix
         ) const -> void { 
-      std::cout << prefix << "[ " + cpp2::to_string(name) + " | " + cpp2::to_string(addr) + " ]" << suffix; }
+    std::cout << prefix << "[ " + cpp2::to_string(name) + " | " + cpp2::to_string(addr) + " ]" << suffix; }
 
 };
 

regression-tests/test-results/pure2-types-smf-and-that-3-provide-mvconstruct-and-mvassign.cpp

@@ -78,7 +78,7 @@ class myclass   {
         cpp2::in<std::string_view> prefix, 
         cpp2::in<std::string_view> suffix
         ) const -> void { 
-      std::cout << prefix << "[ " + cpp2::to_string(name) + " | " + cpp2::to_string(addr) + " ]" << suffix; }
+    std::cout << prefix << "[ " + cpp2::to_string(name) + " | " + cpp2::to_string(addr) + " ]" << suffix; }
 
 };
 

regression-tests/test-results/pure2-types-smf-and-that-4-provide-cpassign-and-mvassign.cpp

@@ -78,7 +78,7 @@ class myclass   {
         cpp2::in<std::string_view> prefix, 
         cpp2::in<std::string_view> suffix
         ) const -> void { 
-      std::cout << prefix << "[ " + cpp2::to_string(name) + " | " + cpp2::to_string(addr) + " ]" << suffix; }
+    std::cout << prefix << "[ " + cpp2::to_string(name) + " | " + cpp2::to_string(addr) + " ]" << suffix; }
 
 };
 

regression-tests/test-results/pure2-types-smf-and-that-5-provide-nothing-but-general-case.cpp

@@ -86,7 +86,7 @@ class myclass   {
         cpp2::in<std::string_view> prefix, 
         cpp2::in<std::string_view> suffix
         ) const -> void { 
-      std::cout << prefix << "[ " + cpp2::to_string(name) + " | " + cpp2::to_string(addr) + " ]" << suffix; }
+    std::cout << prefix << "[ " + cpp2::to_string(name) + " | " + cpp2::to_string(addr) + " ]" << suffix; }
 
 };