finish TS grammar

spec.md

@@ -365,7 +365,10 @@ def add = a -> b -> a + b
 - `if cond then a else b`
 - `{field1: val1, field2: val2}` field construction
 - `match expr with <match cases>`: [pattern matching](##pattern-matching)
+- `'Tag expr`
 - `a = b` the [equality operator](##equality-operator)
+- `-a`: identical to `\`-a\`(a)` name: "negate"
+- `a ^ b`: identical to `\`a^b\`(a, b)` name: "exponent"
 - `a + b`: identical to `\`a+b\`(a, b)` name: "sum"
 - `a - b`: identical to `\`a-b\`(a, b)` name: "difference"
 - `a * b`: identical to `\`a*b\`(a, b)` name: "times"