} else if cl, ok := t.(*Closure); ok {
				// A closure doesn't have a value.
				st.advance(1)
				return &LambdaExpr{Type: cl}
			} else if isArrayType(t) {
				st.advance(1)
				return &StringLiteral{Type: t}
			} else {
				st.fail("missing literal value")
			}
		}
		i := 0
		for len(st.str) > i && st.str[i] != 'E' {
			i++
		}
		val := st.str[:i]
		st.advance(i)