1 files changed, 4 insertions, 2 deletions
diff --git a/src/Lexer.zig b/src/Lexer.zig
index 4665379..4b664fe 100644
--- a/src/Lexer.zig
+++ b/src/Lexer.zig
@@ -13,6 +13,7 @@ pub const Token = struct {
         plus,
         minus,
         equal,
+        colon,
         invalid,
         eof,
         identifier,
@@ -22,7 +23,6 @@ pub const Token = struct {
         right_angle_equal,
 
         // Keywords
-        let,
         @"if",
         @"else",
         @"while",
@@ -34,6 +34,7 @@ pub const Location = struct {
     end: usize,
 
     pub fn combine(a: Location, b: Location) Location {
+        if (a.start == b.start and a.end == b.end) return a;
         std.debug.assert(a.end <= b.start);
         return .{ .start = @min(a.start, b.start), .end = @max(a.end, b.end) };
     }
@@ -83,6 +84,7 @@ fn getNext(self: *Self) Token {
         '+' => self.create(.plus),
         '-' => self.create(.minus),
         '=' => self.create(.equal),
+        ':' => self.create(.colon),
         '<' => if (self.eatIfEqual('='))
             self.create(.left_angle_equal)
         else
@@ -135,7 +137,7 @@ fn identifierOrKeyword(self: *Self) Token {
         }
         const value = self.source[self.start..self.pos];
         return self.create(switch (std.meta.stringToEnum(Token.Type, value) orelse .invalid) {
-            .let, .@"if", .@"else", .@"while" => |t| t,
+            .@"if", .@"else", .@"while" => |t| t,
             else => .identifier,
         });
     }