From 14e205cabc50b45096ca260eaa7913466a60ea76 Mon Sep 17 00:00:00 2001
From: Stephen Chung <schungx@live.com>
Date: Tue, 21 Feb 2023 18:16:03 +0800
Subject: [PATCH] Satisfy msrv by removing then_some.

---
 src/eval/stmt.rs | 2 +-
 src/func/call.rs | 8 ++++----
 src/optimizer.rs | 2 +-
 src/parser.rs    | 2 +-
 src/tokenizer.rs | 2 +-
 5 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/eval/stmt.rs b/src/eval/stmt.rs
index 4d58a9d7..99958724 100644
--- a/src/eval/stmt.rs
+++ b/src/eval/stmt.rs
@@ -140,7 +140,7 @@ impl Engine {
                     auto_restore! { let orig_level = global.level; global.level += 1 }
 
                     let context = need_context
-                        .then_some((self, op_x_str, global.source(), &*global, pos).into());
+                        .then(|| (self, op_x_str, global.source(), &*global, pos).into());
                     return func(context, args).map(|_| ());
                 }
             }
diff --git a/src/func/call.rs b/src/func/call.rs
index 0165719c..490ce278 100644
--- a/src/func/call.rs
+++ b/src/func/call.rs
@@ -400,7 +400,7 @@ impl Engine {
 
             let context = func
                 .has_context()
-                .then_some((self, name, src, &*global, pos).into());
+                .then(|| (self, name, src, &*global, pos).into());
 
             let mut _result = if let Some(f) = func.get_plugin_fn() {
                 if !f.is_pure() && !args.is_empty() && args[0].is_read_only() {
@@ -1460,7 +1460,7 @@ impl Engine {
                 let f = f.get_plugin_fn().expect("plugin function");
                 let context = f
                     .has_context()
-                    .then_some((self, fn_name, module.id(), &*global, pos).into());
+                    .then(|| (self, fn_name, module.id(), &*global, pos).into());
                 if !f.is_pure() && !args.is_empty() && args[0].is_read_only() {
                     Err(ERR::ErrorNonPureMethodCallOnConstant(fn_name.to_string(), pos).into())
                 } else {
@@ -1473,7 +1473,7 @@ impl Engine {
                 let func = f.get_native_fn().expect("native function");
                 let context = f
                     .has_context()
-                    .then_some((self, fn_name, module.id(), &*global, pos).into());
+                    .then(|| (self, fn_name, module.id(), &*global, pos).into());
                 func(context, args).and_then(|r| self.check_data_size(r, pos))
             }
 
@@ -1600,7 +1600,7 @@ impl Engine {
                 auto_restore! { let orig_level = global.level; global.level += 1 }
 
                 let context =
-                    need_context.then_some((self, name.as_str(), None, &*global, pos).into());
+                    need_context.then(|| (self, name.as_str(), None, &*global, pos).into());
                 return func(context, operands);
             }
 
diff --git a/src/optimizer.rs b/src/optimizer.rs
index c702c0a0..c2dcb0c1 100644
--- a/src/optimizer.rs
+++ b/src/optimizer.rs
@@ -1137,7 +1137,7 @@ fn optimize_expr(expr: &mut Expr, state: &mut OptimizerState, _chaining: bool) {
                 _ if x.args.len() == 2 && x.op_token.is_some() && (state.engine.fast_operators() || !state.engine.has_native_fn_override(x.hashes.native(), &arg_types)) => {
                     if let Some(result) = get_builtin_binary_op_fn(x.op_token.as_ref().unwrap(), &arg_values[0], &arg_values[1])
                         .and_then(|(f, ctx)| {
-                            let context = ctx.then_some((state.engine, x.name.as_str(), None, &state.global, *pos).into());
+                            let context = ctx.then(|| (state.engine, x.name.as_str(), None, &state.global, *pos).into());
                             let (first, second) = arg_values.split_first_mut().unwrap();
                             (f)(context, &mut [ first, &mut second[0] ]).ok()
                         }) {
diff --git a/src/parser.rs b/src/parser.rs
index 927d292b..6d4fd19b 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -2354,7 +2354,7 @@ impl Engine {
             let op = op_token.to_string();
             let hash = calc_fn_hash(None, &op, 2);
             let native_only = !is_valid_function_name(&op);
-            let operator_token = native_only.then_some(op_token.clone());
+            let operator_token = native_only.then(|| op_token.clone());
 
             let mut args = FnArgsVec::new_const();
             args.push(root);
diff --git a/src/tokenizer.rs b/src/tokenizer.rs
index 9a22fe55..2d27a948 100644
--- a/src/tokenizer.rs
+++ b/src/tokenizer.rs
@@ -1229,7 +1229,7 @@ fn get_next_token_inner(
     // Still inside a comment?
     if state.comment_level > 0 {
         let start_pos = *pos;
-        let mut comment = state.include_comments.then_some(String::new());
+        let mut comment = state.include_comments.then(|| String::new());
 
         state.comment_level =
             scan_block_comment(stream, state.comment_level, pos, comment.as_mut());