Commit: runtime(cpp): Fix c++ float and integer literal syntax highlighting
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Christian Brabandt
Jan 8, 2026, 4:31:12 PM (yesterday) Jan 8
to vim...@googlegroups.com
runtime(cpp): Fix c++ float and integer literal syntax highlighting
Commit: https://github.com/vim/vim/commit/335aecd98f75a081ad34b99e34922f3e7e0b25ea
Author: Dominique Pelle <dominiq...@gmail.com>
Date: Thu Jan 8 21:18:58 2026 +0000
runtime(cpp): Fix c++ float and integer literal syntax highlighting
closes: https://github.com/vim/vim/issues/8939
Co-authored-by: Eisuke Kawashima <e-k...@users.noreply.github.com>
Signed-off-by: Dominique Pelle <dominiq...@gmail.com>
Signed-off-by: Christian Brabandt <c...@256bit.org>
diff --git a/runtime/syntax/cpp.vim b/runtime/syntax/cpp.vim
index 2bf5b1ffc..5ea52ec50 100644
--- a/runtime/syntax/cpp.vim
+++ b/runtime/syntax/cpp.vim
@@ -4,8 +4,9 @@
" Previous Maintainer: vim-jp (https://github.com/vim-jp/vim-cpp)
" Ken Shan <ccs...@post.harvard.edu>
" Last Change: 2024 May 04
-" 2024 May 04 by Vim Project (fix digit separator in octals and floats)
-" 2026 Jan 06 by Vim Project (announce adoption)
+" 2024 May 04 by Vim Project fix digit separator in octals and floats
+" 2026 Jan 06 by Vim Project orphaning announcement
+" 2026 Jan 08 by Vim Project highlight capital letter prefixes for numbers
" quit when a syntax file was already loaded
if exists("b:current_syntax")
@@ -59,11 +60,11 @@ if !exists("cpp_no_cpp14")
syn match cppNumber display contained "\<0\([Uu]\=\([Ll]\|LL\|ll\)\|\([Ll]\|LL\|ll\)\=[Uu]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
syn match cppNumber display contained "\<[1-9]\('\=\d\+\)*\([Uu]\=\([Ll]\|LL\|ll\)\|\([Ll]\|LL\|ll\)\=[Uu]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
syn match cppNumber display contained "\<0\('\=\o\+\)\+\([Uu]\=\([Ll]\|LL\|ll\)\|\([Ll]\|LL\|ll\)\=[Uu]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
- syn match cppNumber display contained "\<0b[01]\('\=[01]\+\)*\([Uu]\=\([Ll]\|LL\|ll\)\|\([Ll]\|LL\|ll\)\=[Uu]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
- syn match cppNumber display contained "\<0x\x\('\=\x\+\)*\([Uu]\=\([Ll]\|LL\|ll\)\|\([Ll]\|LL\|ll\)\=[Uu]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
- syn match cppFloat display contained "\<\d\('\=\d\+\)*\.\(\d\('\=\d\+\)*\)\=\(e[-+]\=\d\+\)\=\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
- syn match cppFloat display contained "\.\d\('\=\d\+\)*\(e[-+]\=\d\+\)\=\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
- syn match cppFloat display contained "\<\d\+e[-+]\=\d\+\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
+ syn match cppNumber display contained "\<0[Bb][01]\('\=[01]\+\)*\([Uu]\=\([Ll]\|LL\|ll\)\|\([Ll]\|LL\|ll\)\=[Uu]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
+ syn match cppNumber display contained "\<0[Xx]\x\('\=\x\+\)*\([Uu]\=\([Ll]\|LL\|ll\)\|\([Ll]\|LL\|ll\)\=[Uu]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
+ syn match cppFloat display contained "\<\d\('\=\d\+\)*\.\(\d\('\=\d\+\)*\)\=\([Ee][-+]\=\d\+\)\=\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
+ syn match cppFloat display contained "\.\d\('\=\d\+\)*\([Ee][-+]\=\d\+\)\=\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
+ syn match cppFloat display contained "\<\d\+[Ee][-+]\=\d\+\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
syn region cppString start=+\(L\|u\|u8\|U\)\="+ skip=+\\\|\"\|\$+ excludenl end=+"\(sv\|s\|_\i*\)\=+ end='$' contains=cSpecial,cFormat,@Spell
endif
@@ -71,8 +72,8 @@ endif
if !exists("cpp_no_cpp17")
syn match cppCast "\<reinterpret_pointer_cast\s*<"me=e-1
syn match cppCast "\<reinterpret_pointer_cast\s*$"
- syn match cppFloat display contained "\<0x\x*\.\x\+p[-+]\=\d\+\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
- syn match cppFloat display contained "\<0x\x\+\.\=p[-+]\=\d\+\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
+ syn match cppFloat display contained "\<0[Xx]\x*\.\x\+p[-+]\=\d\+\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
+ syn match cppFloat display contained "\<0[Xx]\x\+\.\=p[-+]\=\d\+\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
" TODO: push this up to c.vim if/when supported in C23
syn match cppCharacter "u8'[^\]'"
@@ -94,8 +95,8 @@ if !exists("cpp_no_cpp20")
syn match cppNumber display contained "\<0\(y\|d\)\>"
syn match cppNumber display contained "\<[1-9]\('\=\d\+\)*\(y\|d\)\>"
syn match cppNumber display contained "\<0\o\+\(y\|d\)\>"
- syn match cppNumber display contained "\<0b[01]\('\=[01]\+\)*\(y\|d\)\>"
- syn match cppNumber display contained "\<0x\x\('\=\x\+\)*\(y\|d\)\>"
+ syn match cppNumber display contained "\<0[Bb][01]\('\=[01]\+\)*\(y\|d\)\>"
+ syn match cppNumber display contained "\<0[Xx]\x\('\=\x\+\)*\(y\|d\)\>"
syn keyword cppStatement co_await co_return co_yield requires
syn keyword cppStorageClass consteval constinit
syn keyword cppStructure concept
diff --git a/runtime/syntax/testdir/dumps/cpp_numbers_00.dump b/runtime/syntax/testdir/dumps/cpp_numbers_00.dump
new file mode 100644
index 000000000..41a236a0e
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/cpp_numbers_00.dump
@@ -0,0 +1,20 @@
+>v+0#00e0003#ffffff0|o|i|d| +0#0000000&|f|o@1|(|)| @64
+|{| @73
+@4|{| @69
+@8|/+0#0000e05&@1| |S|e@1| |h|t@1|p|s|:|/@1|e|n|.|c|p@1|r|e|f|e|r|e|n|c|e|.|c|o|m|/|w|/|c|p@1|/|l|a|n|g|u|a|g|e|/|f|l|o|a|t|i|n|g|_|l|i|t|e|r|a|l| +0#0000000&
+@8|d+0#00e0003&|o|u|b|l|e| +0#0000000&|a| |=| |1+0#e000002&|.|0|E|2|;+0#0000000&| @49
+@8|d+0#00e0003&|o|u|b|l|e| +0#0000000&|b| |=| |1+0#e000002&|.|0|e|2|;+0#0000000&| @49
+@8|d+0#00e0003&|o|u|b|l|e| +0#0000000&|c| |=| |1+0#e000002&|E|2|;+0#0000000&| @51
+@8|d+0#00e0003&|o|u|b|l|e| +0#0000000&|d| |=| |1+0#e000002&|e|2|;+0#0000000&| @51
+@75
+@8|d+0#00e0003&|o|u|b|l|e| +0#0000000&|e| |=| |0+0#e000002&|X|1|f@1|p|1|0|;+0#0000000&| @46
+@8|d+0#00e0003&|o|u|b|l|e| +0#0000000&|f| |=| |0+0#e000002&|x|1|f@1|p|1|0|;+0#0000000&| @46
+@4|}| @69
+@75
+@4|/+0#0000e05&@1| |S|e@1|:| |h|t@1|p|s|:|/@1|e|n|.|c|p@1|r|e|f|e|r|e|n|c|e|.|c|o|m|/|w|/|c|p@1|/|l|a|n|g|u|a|g|e|/|i|n|t|e|g|e|r|_|l|i|t|e|r|a|l| +0#0000000&@4
+@4|i+0#00e0003&|n|t| +0#0000000&|a| |=| |0+0#e000002&|X|1|2|3|;+0#0000000&| @56
+@4|i+0#00e0003&|n|t| +0#0000000&|b| |=| |0+0#e000002&|x|1|2|3|;+0#0000000&| @56
+@75
+@4|i+0#00e0003&|n|t| +0#0000000&|c| |=| |0+0#e000002&|B|1|0|1|;+0#0000000&| @56
+@4|i+0#00e0003&|n|t| +0#0000000&|d| |=| |0+0#e000002&|b|1|0|1|;+0#0000000&| @56
+@57|1|,|1| @10|T|o|p|
diff --git a/runtime/syntax/testdir/dumps/cpp_numbers_01.dump b/runtime/syntax/testdir/dumps/cpp_numbers_01.dump
new file mode 100644
index 000000000..85a85c1d8
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/cpp_numbers_01.dump
@@ -0,0 +1,20 @@
+| +0&#ffffff0@3|/+0#0000e05&@1| |S|e@1|:| |h|t@1|p|s|:|/@1|e|n|.|c|p@1|r|e|f|e|r|e|n|c|e|.|c|o|m|/|w|/|c|p@1|/|l|a|n|g|u|a|g|e|/|i|n|t|e|g|e|r|_|l|i|t|e|r|a|l| +0#0000000&@4
+@4|i+0#00e0003&|n|t| +0#0000000&|a| |=| |0+0#e000002&|X|1|2|3|;+0#0000000&| @56
+@4|i+0#00e0003&|n|t| +0#0000000&|b| |=| |0+0#e000002&|x|1|2|3|;+0#0000000&| @56
+@75
+@4|i+0#00e0003&|n|t| +0#0000000&|c| |=| |0+0#e000002&|B|1|0|1|;+0#0000000&| @56
+@4>i+0#00e0003&|n|t| +0#0000000&|d| |=| |0+0#e000002&|b|1|0|1|;+0#0000000&| @56
+|}| @73
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+| +0#0000000&@56|1|9|,|5| @9|B|o|t|
diff --git a/runtime/syntax/testdir/input/cpp_numbers.cpp b/runtime/syntax/testdir/input/cpp_numbers.cpp
new file mode 100644
index 000000000..d6ef21b0a
--- /dev/null
+++ b/runtime/syntax/testdir/input/cpp_numbers.cpp
@@ -0,0 +1,20 @@
+void foo()
+{
+ {
+ // See https://en.cppreference.com/w/cpp/language/floating_literal
+ double a = 1.0E2;
+ double b = 1.0e2;
+ double c = 1E2;
+ double d = 1e2;
+
+ double e = 0X1ffp10;
+ double f = 0x1ffp10;
+ }
+
+ // See: https://en.cppreference.com/w/cpp/language/integer_literal
+ int a = 0X123;
+ int b = 0x123;
+
+ int c = 0B101;
+ int d = 0b101;
+}
Commit: https://github.com/vim/vim/commit/335aecd98f75a081ad34b99e34922f3e7e0b25ea
Author: Dominique Pelle <dominiq...@gmail.com>
Date: Thu Jan 8 21:18:58 2026 +0000
runtime(cpp): Fix c++ float and integer literal syntax highlighting
closes: https://github.com/vim/vim/issues/8939
Co-authored-by: Eisuke Kawashima <e-k...@users.noreply.github.com>
Signed-off-by: Dominique Pelle <dominiq...@gmail.com>
Signed-off-by: Christian Brabandt <c...@256bit.org>
diff --git a/runtime/syntax/cpp.vim b/runtime/syntax/cpp.vim
index 2bf5b1ffc..5ea52ec50 100644
--- a/runtime/syntax/cpp.vim
+++ b/runtime/syntax/cpp.vim
@@ -4,8 +4,9 @@
" Previous Maintainer: vim-jp (https://github.com/vim-jp/vim-cpp)
" Ken Shan <ccs...@post.harvard.edu>
" Last Change: 2024 May 04
-" 2024 May 04 by Vim Project (fix digit separator in octals and floats)
-" 2026 Jan 06 by Vim Project (announce adoption)
+" 2024 May 04 by Vim Project fix digit separator in octals and floats
+" 2026 Jan 06 by Vim Project orphaning announcement
+" 2026 Jan 08 by Vim Project highlight capital letter prefixes for numbers
" quit when a syntax file was already loaded
if exists("b:current_syntax")
@@ -59,11 +60,11 @@ if !exists("cpp_no_cpp14")
syn match cppNumber display contained "\<0\([Uu]\=\([Ll]\|LL\|ll\)\|\([Ll]\|LL\|ll\)\=[Uu]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
syn match cppNumber display contained "\<[1-9]\('\=\d\+\)*\([Uu]\=\([Ll]\|LL\|ll\)\|\([Ll]\|LL\|ll\)\=[Uu]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
syn match cppNumber display contained "\<0\('\=\o\+\)\+\([Uu]\=\([Ll]\|LL\|ll\)\|\([Ll]\|LL\|ll\)\=[Uu]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
- syn match cppNumber display contained "\<0b[01]\('\=[01]\+\)*\([Uu]\=\([Ll]\|LL\|ll\)\|\([Ll]\|LL\|ll\)\=[Uu]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
- syn match cppNumber display contained "\<0x\x\('\=\x\+\)*\([Uu]\=\([Ll]\|LL\|ll\)\|\([Ll]\|LL\|ll\)\=[Uu]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
- syn match cppFloat display contained "\<\d\('\=\d\+\)*\.\(\d\('\=\d\+\)*\)\=\(e[-+]\=\d\+\)\=\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
- syn match cppFloat display contained "\.\d\('\=\d\+\)*\(e[-+]\=\d\+\)\=\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
- syn match cppFloat display contained "\<\d\+e[-+]\=\d\+\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
+ syn match cppNumber display contained "\<0[Bb][01]\('\=[01]\+\)*\([Uu]\=\([Ll]\|LL\|ll\)\|\([Ll]\|LL\|ll\)\=[Uu]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
+ syn match cppNumber display contained "\<0[Xx]\x\('\=\x\+\)*\([Uu]\=\([Ll]\|LL\|ll\)\|\([Ll]\|LL\|ll\)\=[Uu]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
+ syn match cppFloat display contained "\<\d\('\=\d\+\)*\.\(\d\('\=\d\+\)*\)\=\([Ee][-+]\=\d\+\)\=\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
+ syn match cppFloat display contained "\.\d\('\=\d\+\)*\([Ee][-+]\=\d\+\)\=\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
+ syn match cppFloat display contained "\<\d\+[Ee][-+]\=\d\+\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
syn region cppString start=+\(L\|u\|u8\|U\)\="+ skip=+\\\|\"\|\$+ excludenl end=+"\(sv\|s\|_\i*\)\=+ end='$' contains=cSpecial,cFormat,@Spell
endif
@@ -71,8 +72,8 @@ endif
if !exists("cpp_no_cpp17")
syn match cppCast "\<reinterpret_pointer_cast\s*<"me=e-1
syn match cppCast "\<reinterpret_pointer_cast\s*$"
- syn match cppFloat display contained "\<0x\x*\.\x\+p[-+]\=\d\+\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
- syn match cppFloat display contained "\<0x\x\+\.\=p[-+]\=\d\+\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
+ syn match cppFloat display contained "\<0[Xx]\x*\.\x\+p[-+]\=\d\+\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
+ syn match cppFloat display contained "\<0[Xx]\x\+\.\=p[-+]\=\d\+\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
" TODO: push this up to c.vim if/when supported in C23
syn match cppCharacter "u8'[^\]'"
@@ -94,8 +95,8 @@ if !exists("cpp_no_cpp20")
syn match cppNumber display contained "\<0\(y\|d\)\>"
syn match cppNumber display contained "\<[1-9]\('\=\d\+\)*\(y\|d\)\>"
syn match cppNumber display contained "\<0\o\+\(y\|d\)\>"
- syn match cppNumber display contained "\<0b[01]\('\=[01]\+\)*\(y\|d\)\>"
- syn match cppNumber display contained "\<0x\x\('\=\x\+\)*\(y\|d\)\>"
+ syn match cppNumber display contained "\<0[Bb][01]\('\=[01]\+\)*\(y\|d\)\>"
+ syn match cppNumber display contained "\<0[Xx]\x\('\=\x\+\)*\(y\|d\)\>"
syn keyword cppStatement co_await co_return co_yield requires
syn keyword cppStorageClass consteval constinit
syn keyword cppStructure concept
diff --git a/runtime/syntax/testdir/dumps/cpp_numbers_00.dump b/runtime/syntax/testdir/dumps/cpp_numbers_00.dump
new file mode 100644
index 000000000..41a236a0e
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/cpp_numbers_00.dump
@@ -0,0 +1,20 @@
+>v+0#00e0003#ffffff0|o|i|d| +0#0000000&|f|o@1|(|)| @64
+|{| @73
+@4|{| @69
+@8|/+0#0000e05&@1| |S|e@1| |h|t@1|p|s|:|/@1|e|n|.|c|p@1|r|e|f|e|r|e|n|c|e|.|c|o|m|/|w|/|c|p@1|/|l|a|n|g|u|a|g|e|/|f|l|o|a|t|i|n|g|_|l|i|t|e|r|a|l| +0#0000000&
+@8|d+0#00e0003&|o|u|b|l|e| +0#0000000&|a| |=| |1+0#e000002&|.|0|E|2|;+0#0000000&| @49
+@8|d+0#00e0003&|o|u|b|l|e| +0#0000000&|b| |=| |1+0#e000002&|.|0|e|2|;+0#0000000&| @49
+@8|d+0#00e0003&|o|u|b|l|e| +0#0000000&|c| |=| |1+0#e000002&|E|2|;+0#0000000&| @51
+@8|d+0#00e0003&|o|u|b|l|e| +0#0000000&|d| |=| |1+0#e000002&|e|2|;+0#0000000&| @51
+@75
+@8|d+0#00e0003&|o|u|b|l|e| +0#0000000&|e| |=| |0+0#e000002&|X|1|f@1|p|1|0|;+0#0000000&| @46
+@8|d+0#00e0003&|o|u|b|l|e| +0#0000000&|f| |=| |0+0#e000002&|x|1|f@1|p|1|0|;+0#0000000&| @46
+@4|}| @69
+@75
+@4|/+0#0000e05&@1| |S|e@1|:| |h|t@1|p|s|:|/@1|e|n|.|c|p@1|r|e|f|e|r|e|n|c|e|.|c|o|m|/|w|/|c|p@1|/|l|a|n|g|u|a|g|e|/|i|n|t|e|g|e|r|_|l|i|t|e|r|a|l| +0#0000000&@4
+@4|i+0#00e0003&|n|t| +0#0000000&|a| |=| |0+0#e000002&|X|1|2|3|;+0#0000000&| @56
+@4|i+0#00e0003&|n|t| +0#0000000&|b| |=| |0+0#e000002&|x|1|2|3|;+0#0000000&| @56
+@75
+@4|i+0#00e0003&|n|t| +0#0000000&|c| |=| |0+0#e000002&|B|1|0|1|;+0#0000000&| @56
+@4|i+0#00e0003&|n|t| +0#0000000&|d| |=| |0+0#e000002&|b|1|0|1|;+0#0000000&| @56
+@57|1|,|1| @10|T|o|p|
diff --git a/runtime/syntax/testdir/dumps/cpp_numbers_01.dump b/runtime/syntax/testdir/dumps/cpp_numbers_01.dump
new file mode 100644
index 000000000..85a85c1d8
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/cpp_numbers_01.dump
@@ -0,0 +1,20 @@
+| +0&#ffffff0@3|/+0#0000e05&@1| |S|e@1|:| |h|t@1|p|s|:|/@1|e|n|.|c|p@1|r|e|f|e|r|e|n|c|e|.|c|o|m|/|w|/|c|p@1|/|l|a|n|g|u|a|g|e|/|i|n|t|e|g|e|r|_|l|i|t|e|r|a|l| +0#0000000&@4
+@4|i+0#00e0003&|n|t| +0#0000000&|a| |=| |0+0#e000002&|X|1|2|3|;+0#0000000&| @56
+@4|i+0#00e0003&|n|t| +0#0000000&|b| |=| |0+0#e000002&|x|1|2|3|;+0#0000000&| @56
+@75
+@4|i+0#00e0003&|n|t| +0#0000000&|c| |=| |0+0#e000002&|B|1|0|1|;+0#0000000&| @56
+@4>i+0#00e0003&|n|t| +0#0000000&|d| |=| |0+0#e000002&|b|1|0|1|;+0#0000000&| @56
+|}| @73
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+| +0#0000000&@56|1|9|,|5| @9|B|o|t|
diff --git a/runtime/syntax/testdir/input/cpp_numbers.cpp b/runtime/syntax/testdir/input/cpp_numbers.cpp
new file mode 100644
index 000000000..d6ef21b0a
--- /dev/null
+++ b/runtime/syntax/testdir/input/cpp_numbers.cpp
@@ -0,0 +1,20 @@
+void foo()
+{
+ {
+ // See https://en.cppreference.com/w/cpp/language/floating_literal
+ double a = 1.0E2;
+ double b = 1.0e2;
+ double c = 1E2;
+ double d = 1e2;
+
+ double e = 0X1ffp10;
+ double f = 0x1ffp10;
+ }
+
+ // See: https://en.cppreference.com/w/cpp/language/integer_literal
+ int a = 0X123;
+ int b = 0x123;
+
+ int c = 0B101;
+ int d = 0b101;
+}
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