Allow call and unary expressions as map keys.

src/vm/wren_compiler.c

@@ -1987,7 +1987,7 @@ static void map(Compiler* compiler, bool allowAssignment)
     if (peek(compiler) == TOKEN_RIGHT_BRACE) break;
 
     // The key.
-    parsePrecedence(compiler, false, PREC_PRIMARY);
+    parsePrecedence(compiler, false, PREC_UNARY);
     consume(compiler, TOKEN_COLON, "Expect ':' after map key.");
     ignoreNewlines(compiler);
 

test/language/map/bad_key_precedence.wren

@@ -0,0 +1,3 @@
+var map = {
+  1 + 2: "bad key" // expect error
+}

test/language/map/precedence.wren

@@ -0,0 +1,26 @@
+var name = "value"
+
+var map = {
+  // Primary.
+  name: name,
+  1: true,
+
+  // Call.
+  name.count: name.count,
+  name[0]: name[1],
+
+  // Unary.
+  -1: -2,
+  ~3: !false,
+
+  // Allow any expression for a value.
+  "key": true ? 1 : 2
+}
+
+System.print(map[name])       // expect: value
+System.print(map[1])          // expect: true
+System.print(map[name.count]) // expect: 5
+System.print(map[name[0]])    // expect: a
+System.print(map[-1])         // expect: -2
+System.print(map[~3])         // expect: true
+System.print(map["key"])      // expect: 1