Do not use non-ASCII chars in sources

No encodings are guaranteed in C compilers, and other than UTF-8
encodings may be assumed in some platforms, e.g., CP932 on Windows
Japanese edition, and may result in compilation errors.

coroutine/ppc/Context.S

@@ -3,7 +3,7 @@
 ; Some relevant examples: https://github.com/gcc-mirror/gcc/blob/master/libphobos/libdruntime/config/powerpc/switchcontext.S
 ; https://github.com/gcc-mirror/gcc/blob/master/libgcc/config/rs6000/darwin-gpsave.S
 ; https://www.ibm.com/docs/en/aix/7.2?topic=epilogs-saving-gprs-only
-; ppc32 version may be re-written compactly with stmw/lwm, but the code wonʼt be faster, see: https://github.com/ruby/ruby/pull/5927#issuecomment-1139730541
+; ppc32 version may be re-written compactly with stmw/lwm, but the code won't be faster, see: https://github.com/ruby/ruby/pull/5927#issuecomment-1139730541
 
 ; Notice that this code is only for Darwin (macOS). Darwin ABI differs from AIX and ELF.
 ; To add support for AIX, *BSD or *Linux, please make separate implementations.

coroutine/ppc/Context.h

@@ -13,7 +13,7 @@
 
 enum {
   COROUTINE_REGISTERS =
-  20  /* 19 general purpose registers (r13–r31) and 1 return address */
+  20  /* 19 general purpose registers (r13-r31) and 1 return address */
   + 4  /* space for fiber_entry() to store the link register */
 };
 

coroutine/ppc64/Context.h

@@ -12,7 +12,7 @@
 
 enum {
   COROUTINE_REGISTERS =
-  20  /* 19 general purpose registers (r13–r31) and 1 return address */
+  20  /* 19 general purpose registers (r13-r31) and 1 return address */
   + 4  /* space for fiber_entry() to store the link register */
 };
 

prism/regexp.c

@@ -116,18 +116,18 @@ pm_regexp_char_find(pm_regexp_parser_t *parser, uint8_t value) {
  * The properly track everything, we're going to build a little state machine.
  * It looks something like the following:
  *
- *                  ┌───────┐                 ┌─────────┐ ────────────┐
+ *                  +-------+                 +---------+ ------------+
- * ──── lbrace ───> │ start │ ──── digit ───> │ minimum │             │
+ * ---- lbrace ---> | start | ---- digit ---> | minimum |             |
- *                  └───────┘                 └─────────┘ <─── digit ─┘
+ *                  +-------+                 +---------+ <--- digit -+
- *                      │                       │    │
+ *                      |                       |    |
- *   ┌───────┐          │                       │  rbrace
+ *   +-------+          |                       |  rbrace
- *   │ comma │ <───── comma  ┌──── comma ───────┘    │
+ *   | comma | <----- comma  +---- comma -------+    |
- *   └───────┘               V                       V
+ *   +-------+               V                       V
- *      │             ┌─────────┐               ┌─────────┐
+ *      |             +---------+               +---------+
- *      └── digit ──> │ maximum │ ── rbrace ──> │| final |│
+ *      +-- digit --> | maximum | -- rbrace --> || final ||
- *                    └─────────┘               └─────────┘
+ *                    +---------+               +---------+
- *                    │         ^
+ *                    |         ^
- *                    └─ digit ─┘
+ *                    +- digit -+
  *
  * Note that by the time we've hit this function, the lbrace has already been
  * consumed so we're in the start state.

prism/templates/template.rb

@@ -360,6 +360,7 @@ module Prism
           =end
           HEADING
       else
+        escape = true
         <<~HEADING
         /******************************************************************************/
         /* This file is generated by the templates/template.rb script and should not  */
@@ -373,6 +374,9 @@ module Prism
 
       write_to ||= File.expand_path("../#{name}", __dir__)
       contents = heading + erb.result_with_hash(locals)
+      if escape
+        (contents = contents.b).gsub!(/[^\t-~]/) {|c| "\\x%.2x" % c.ord}
+      end
 
       FileUtils.mkdir_p(File.dirname(write_to))
       File.write(write_to, contents)