Merge pull request #4197 from WalterBright/scopeswitch

DIP69: add -scope switch

src/mars.c

@@ -304,6 +304,7 @@ Usage:\n\
   -property      enforce property syntax\n\
   -release       compile release version\n\
   -run srcfile args...   run resulting program, passing args\n\
+  -scope         diagnose scope errors (experimental)\n\
   -shared        generate shared library (DLL)\n\
   -transition=id show additional info about language change identified by 'id'\n\
   -transition=?  list all language changes\n\
@@ -816,6 +817,8 @@ Language changes listed by -transition=id:\n\
                 global.params.enforcePropertySyntax = true;
             else if (strcmp(p + 1, "inline") == 0)
                 global.params.useInline = true;
+            else if (strcmp(p + 1, "scope") == 0)
+                global.params.useScope = true;
             else if (strcmp(p + 1, "lib") == 0)
                 global.params.lib = true;
             else if (strcmp(p + 1, "nofloat") == 0)

src/mars.h

@@ -124,6 +124,7 @@ struct Param
     bool useSwitchError; // check for switches without a default
     bool useUnitTests;  // generate unittest code
     bool useInline;     // inline expand functions
+    bool useScope;      // diagnose 'scope' errors
     bool release;       // build release version
     bool preservePaths; // true means don't strip path from source file
     char warnings;      // 0: enable warnings

test/runnable/testscope2.d

@@ -0,0 +1,11 @@
+// PERMUTE_ARGS: -scope
+
+import core.stdc.stdio;
+
+/********************************************/
+
+void main()
+{
+    printf("Success\n");
+}
+