Move predefined module into context module.

src/context/mod.rs

@@ -6,9 +6,13 @@
 
 use std::collections::HashMap;
 
-use crate::{function::Function, value::value_type::ValueType, EvalexprError, EvalexprResult};
+use crate::{
+    function::Function,
+    value::{value_type::ValueType, Value},
+    EvalexprError, EvalexprResult,
+};
 
-use crate::value::Value;
+mod predefined;
 
 /// An immutable context.
 pub trait Context {

src/context/predefined/mod.rs

@@ -1,4 +1,4 @@
-/// Context with all f64::consts available by default.
+/// Context with all Rust's constants in `f64::consts` available by default.
 /// Alternatively, specifiy constants with `math_consts_context!(E, PI, TAU, ...)`
 /// Available constants can be found in the [`core::f64::consts module`](https://doc.rust-lang.org/nightly/core/f64/consts/index.html).
 #[macro_export]

src/lib.rs

@@ -523,7 +523,6 @@ mod feature_serde;
 mod function;
 mod interface;
 mod operator;
-mod predefined;
 mod token;
 mod tree;
 mod value;