scanner: fix SlashEqual generation not skipping its own chars

- parser: allow SlashEqual on main mkAssign/mkSet call
 - readme: += and gang are done

README.md

@@ -34,7 +34,6 @@ negatively charged towards
 
 ## wip
 
- - `+=`, `-=`, and the rest of the gang
  - no `for` yet
  - no arrays yet
  - no `map` yet

src/parser.zig

@@ -756,7 +756,7 @@ pub const Parser = struct {
                     .ColonEqual => return try self.mkVarDecl(expr.Variable, value, mutable),
                     .Equal => return try self.mkAssign(expr.Variable, value),
 
-                    .PlusEqual, .MinusEqual, .StarEqual => {
+                    .PlusEqual, .MinusEqual, .StarEqual, .SlashEqual => {
                         var new_op = try self.mkToken(new_op_ttype, new_lexeme, op.line);
                         return try self.mkAssign(
                             expr.Variable,
@@ -775,7 +775,9 @@ pub const Parser = struct {
                         return Result.CompileError;
                     },
 
-                    .PlusEqual, .MinusEqual, .StarEqual => {
+                    .Equal => return try self.mkSet(get.struc, get.name, value),
+
+                    .PlusEqual, .MinusEqual, .StarEqual, .SlashEqual => {
                         var new_op = try self.mkToken(new_op_ttype, new_lexeme, op.line);
                         return try self.mkSet(
                             get.struc,
@@ -784,7 +786,6 @@ pub const Parser = struct {
                         );
                     },
 
-                    .Equal => return try self.mkSet(get.struc, get.name, value),
                     else => unreachable,
                 }
             },

src/scanner.zig

@@ -317,7 +317,10 @@ pub const Scanner = struct {
                 var next = self.peekNext();
 
                 switch (next) {
-                    '=' => return self.makeToken(.SlashEqual),
+                    '=' => {
+                        self.current += 1;
+                        return self.makeToken(.SlashEqual);
+                    },
 
                     '/' => blk2: {
                         while (self.peek() != '\n' and !self.isAtEnd()) {