diff --git a/bench/compile-time/CMakeLists.txt b/bench/compile-time/CMakeLists.txt
index 6676afd..dec7058 100644
--- a/bench/compile-time/CMakeLists.txt
+++ b/bench/compile-time/CMakeLists.txt
@@ -8,7 +8,10 @@ find_package(Threads REQUIRED)
 # runtime dependency on Google Benchmark.
 
 function(_ptn_ct_add_lit_tu N)
-  set(_tufile "${CMAKE_CURRENT_SOURCE_DIR}/ct_bench_lit_${N}.cpp")
+  # Generate into the build tree, not the source tree: writing to
+  # CMAKE_CURRENT_SOURCE_DIR dirtied the working tree on every
+  # configure, and the generated files must not be committed.
+  set(_tufile "${CMAKE_CURRENT_BINARY_DIR}/ct_bench_lit_${N}.cpp")
   file(WRITE "${_tufile}"
     "// compile-time literal-match benchmark – forces full instantiation\n"
     "// of the match-dispatch machinery with ${N} literal cases.\n\n"
diff --git a/bench/compile-time/ct_bench_lit_128.cpp b/bench/compile-time/ct_bench_lit_128.cpp
deleted file mode 100644
index 7bae0fc..0000000
--- a/bench/compile-time/ct_bench_lit_128.cpp
+++ /dev/null
@@ -1,144 +0,0 @@
-// compile-time literal-match benchmark – forces full instantiation
-// of the match-dispatch machinery with 128 literal cases.
-
-#include "ptn/patternia.hpp"
-
-constexpr int ct_lit_128(int v) noexcept {
-  using namespace ptn;
-  return match(v)
-         | on(ptn::lit(0) >> 0,
-              ptn::lit(1) >> 1,
-              ptn::lit(2) >> 2,
-              ptn::lit(3) >> 3,
-              ptn::lit(4) >> 4,
-              ptn::lit(5) >> 5,
-              ptn::lit(6) >> 6,
-              ptn::lit(7) >> 7,
-              ptn::lit(8) >> 8,
-              ptn::lit(9) >> 9,
-              ptn::lit(10) >> 10,
-              ptn::lit(11) >> 11,
-              ptn::lit(12) >> 12,
-              ptn::lit(13) >> 13,
-              ptn::lit(14) >> 14,
-              ptn::lit(15) >> 15,
-              ptn::lit(16) >> 16,
-              ptn::lit(17) >> 17,
-              ptn::lit(18) >> 18,
-              ptn::lit(19) >> 19,
-              ptn::lit(20) >> 20,
-              ptn::lit(21) >> 21,
-              ptn::lit(22) >> 22,
-              ptn::lit(23) >> 23,
-              ptn::lit(24) >> 24,
-              ptn::lit(25) >> 25,
-              ptn::lit(26) >> 26,
-              ptn::lit(27) >> 27,
-              ptn::lit(28) >> 28,
-              ptn::lit(29) >> 29,
-              ptn::lit(30) >> 30,
-              ptn::lit(31) >> 31,
-              ptn::lit(32) >> 32,
-              ptn::lit(33) >> 33,
-              ptn::lit(34) >> 34,
-              ptn::lit(35) >> 35,
-              ptn::lit(36) >> 36,
-              ptn::lit(37) >> 37,
-              ptn::lit(38) >> 38,
-              ptn::lit(39) >> 39,
-              ptn::lit(40) >> 40,
-              ptn::lit(41) >> 41,
-              ptn::lit(42) >> 42,
-              ptn::lit(43) >> 43,
-              ptn::lit(44) >> 44,
-              ptn::lit(45) >> 45,
-              ptn::lit(46) >> 46,
-              ptn::lit(47) >> 47,
-              ptn::lit(48) >> 48,
-              ptn::lit(49) >> 49,
-              ptn::lit(50) >> 50,
-              ptn::lit(51) >> 51,
-              ptn::lit(52) >> 52,
-              ptn::lit(53) >> 53,
-              ptn::lit(54) >> 54,
-              ptn::lit(55) >> 55,
-              ptn::lit(56) >> 56,
-              ptn::lit(57) >> 57,
-              ptn::lit(58) >> 58,
-              ptn::lit(59) >> 59,
-              ptn::lit(60) >> 60,
-              ptn::lit(61) >> 61,
-              ptn::lit(62) >> 62,
-              ptn::lit(63) >> 63,
-              ptn::lit(64) >> 64,
-              ptn::lit(65) >> 65,
-              ptn::lit(66) >> 66,
-              ptn::lit(67) >> 67,
-              ptn::lit(68) >> 68,
-              ptn::lit(69) >> 69,
-              ptn::lit(70) >> 70,
-              ptn::lit(71) >> 71,
-              ptn::lit(72) >> 72,
-              ptn::lit(73) >> 73,
-              ptn::lit(74) >> 74,
-              ptn::lit(75) >> 75,
-              ptn::lit(76) >> 76,
-              ptn::lit(77) >> 77,
-              ptn::lit(78) >> 78,
-              ptn::lit(79) >> 79,
-              ptn::lit(80) >> 80,
-              ptn::lit(81) >> 81,
-              ptn::lit(82) >> 82,
-              ptn::lit(83) >> 83,
-              ptn::lit(84) >> 84,
-              ptn::lit(85) >> 85,
-              ptn::lit(86) >> 86,
-              ptn::lit(87) >> 87,
-              ptn::lit(88) >> 88,
-              ptn::lit(89) >> 89,
-              ptn::lit(90) >> 90,
-              ptn::lit(91) >> 91,
-              ptn::lit(92) >> 92,
-              ptn::lit(93) >> 93,
-              ptn::lit(94) >> 94,
-              ptn::lit(95) >> 95,
-              ptn::lit(96) >> 96,
-              ptn::lit(97) >> 97,
-              ptn::lit(98) >> 98,
-              ptn::lit(99) >> 99,
-              ptn::lit(100) >> 100,
-              ptn::lit(101) >> 101,
-              ptn::lit(102) >> 102,
-              ptn::lit(103) >> 103,
-              ptn::lit(104) >> 104,
-              ptn::lit(105) >> 105,
-              ptn::lit(106) >> 106,
-              ptn::lit(107) >> 107,
-              ptn::lit(108) >> 108,
-              ptn::lit(109) >> 109,
-              ptn::lit(110) >> 110,
-              ptn::lit(111) >> 111,
-              ptn::lit(112) >> 112,
-              ptn::lit(113) >> 113,
-              ptn::lit(114) >> 114,
-              ptn::lit(115) >> 115,
-              ptn::lit(116) >> 116,
-              ptn::lit(117) >> 117,
-              ptn::lit(118) >> 118,
-              ptn::lit(119) >> 119,
-              ptn::lit(120) >> 120,
-              ptn::lit(121) >> 121,
-              ptn::lit(122) >> 122,
-              ptn::lit(123) >> 123,
-              ptn::lit(124) >> 124,
-              ptn::lit(125) >> 125,
-              ptn::lit(126) >> 126,
-              ptn::lit(127) >> 127,
-              _ >> 0);
-}
-
-static_assert(ct_lit_128(0) == 0, "");
-static_assert(ct_lit_128(64) == 64, "");
-static_assert(ct_lit_128(127) == 127, "");
-static_assert(ct_lit_128(-1) == 0, "");
-static_assert(ct_lit_128(128) == 0, "");
diff --git a/bench/compile-time/ct_bench_lit_16.cpp b/bench/compile-time/ct_bench_lit_16.cpp
deleted file mode 100644
index ee50d4f..0000000
--- a/bench/compile-time/ct_bench_lit_16.cpp
+++ /dev/null
@@ -1,32 +0,0 @@
-// compile-time literal-match benchmark – forces full instantiation
-// of the match-dispatch machinery with 16 literal cases.
-
-#include "ptn/patternia.hpp"
-
-constexpr int ct_lit_16(int v) noexcept {
-  using namespace ptn;
-  return match(v)
-         | on(ptn::lit(0) >> 0,
-              ptn::lit(1) >> 1,
-              ptn::lit(2) >> 2,
-              ptn::lit(3) >> 3,
-              ptn::lit(4) >> 4,
-              ptn::lit(5) >> 5,
-              ptn::lit(6) >> 6,
-              ptn::lit(7) >> 7,
-              ptn::lit(8) >> 8,
-              ptn::lit(9) >> 9,
-              ptn::lit(10) >> 10,
-              ptn::lit(11) >> 11,
-              ptn::lit(12) >> 12,
-              ptn::lit(13) >> 13,
-              ptn::lit(14) >> 14,
-              ptn::lit(15) >> 15,
-              _ >> 0);
-}
-
-static_assert(ct_lit_16(0) == 0, "");
-static_assert(ct_lit_16(8) == 8, "");
-static_assert(ct_lit_16(15) == 15, "");
-static_assert(ct_lit_16(-1) == 0, "");
-static_assert(ct_lit_16(16) == 0, "");
diff --git a/bench/compile-time/ct_bench_lit_32.cpp b/bench/compile-time/ct_bench_lit_32.cpp
deleted file mode 100644
index c522204..0000000
--- a/bench/compile-time/ct_bench_lit_32.cpp
+++ /dev/null
@@ -1,48 +0,0 @@
-// compile-time literal-match benchmark – forces full instantiation
-// of the match-dispatch machinery with 32 literal cases.
-
-#include "ptn/patternia.hpp"
-
-constexpr int ct_lit_32(int v) noexcept {
-  using namespace ptn;
-  return match(v)
-         | on(ptn::lit(0) >> 0,
-              ptn::lit(1) >> 1,
-              ptn::lit(2) >> 2,
-              ptn::lit(3) >> 3,
-              ptn::lit(4) >> 4,
-              ptn::lit(5) >> 5,
-              ptn::lit(6) >> 6,
-              ptn::lit(7) >> 7,
-              ptn::lit(8) >> 8,
-              ptn::lit(9) >> 9,
-              ptn::lit(10) >> 10,
-              ptn::lit(11) >> 11,
-              ptn::lit(12) >> 12,
-              ptn::lit(13) >> 13,
-              ptn::lit(14) >> 14,
-              ptn::lit(15) >> 15,
-              ptn::lit(16) >> 16,
-              ptn::lit(17) >> 17,
-              ptn::lit(18) >> 18,
-              ptn::lit(19) >> 19,
-              ptn::lit(20) >> 20,
-              ptn::lit(21) >> 21,
-              ptn::lit(22) >> 22,
-              ptn::lit(23) >> 23,
-              ptn::lit(24) >> 24,
-              ptn::lit(25) >> 25,
-              ptn::lit(26) >> 26,
-              ptn::lit(27) >> 27,
-              ptn::lit(28) >> 28,
-              ptn::lit(29) >> 29,
-              ptn::lit(30) >> 30,
-              ptn::lit(31) >> 31,
-              _ >> 0);
-}
-
-static_assert(ct_lit_32(0) == 0, "");
-static_assert(ct_lit_32(16) == 16, "");
-static_assert(ct_lit_32(31) == 31, "");
-static_assert(ct_lit_32(-1) == 0, "");
-static_assert(ct_lit_32(32) == 0, "");
diff --git a/bench/compile-time/ct_bench_lit_64.cpp b/bench/compile-time/ct_bench_lit_64.cpp
deleted file mode 100644
index 61c8ba9..0000000
--- a/bench/compile-time/ct_bench_lit_64.cpp
+++ /dev/null
@@ -1,80 +0,0 @@
-// compile-time literal-match benchmark – forces full instantiation
-// of the match-dispatch machinery with 64 literal cases.
-
-#include "ptn/patternia.hpp"
-
-constexpr int ct_lit_64(int v) noexcept {
-  using namespace ptn;
-  return match(v)
-         | on(ptn::lit(0) >> 0,
-              ptn::lit(1) >> 1,
-              ptn::lit(2) >> 2,
-              ptn::lit(3) >> 3,
-              ptn::lit(4) >> 4,
-              ptn::lit(5) >> 5,
-              ptn::lit(6) >> 6,
-              ptn::lit(7) >> 7,
-              ptn::lit(8) >> 8,
-              ptn::lit(9) >> 9,
-              ptn::lit(10) >> 10,
-              ptn::lit(11) >> 11,
-              ptn::lit(12) >> 12,
-              ptn::lit(13) >> 13,
-              ptn::lit(14) >> 14,
-              ptn::lit(15) >> 15,
-              ptn::lit(16) >> 16,
-              ptn::lit(17) >> 17,
-              ptn::lit(18) >> 18,
-              ptn::lit(19) >> 19,
-              ptn::lit(20) >> 20,
-              ptn::lit(21) >> 21,
-              ptn::lit(22) >> 22,
-              ptn::lit(23) >> 23,
-              ptn::lit(24) >> 24,
-              ptn::lit(25) >> 25,
-              ptn::lit(26) >> 26,
-              ptn::lit(27) >> 27,
-              ptn::lit(28) >> 28,
-              ptn::lit(29) >> 29,
-              ptn::lit(30) >> 30,
-              ptn::lit(31) >> 31,
-              ptn::lit(32) >> 32,
-              ptn::lit(33) >> 33,
-              ptn::lit(34) >> 34,
-              ptn::lit(35) >> 35,
-              ptn::lit(36) >> 36,
-              ptn::lit(37) >> 37,
-              ptn::lit(38) >> 38,
-              ptn::lit(39) >> 39,
-              ptn::lit(40) >> 40,
-              ptn::lit(41) >> 41,
-              ptn::lit(42) >> 42,
-              ptn::lit(43) >> 43,
-              ptn::lit(44) >> 44,
-              ptn::lit(45) >> 45,
-              ptn::lit(46) >> 46,
-              ptn::lit(47) >> 47,
-              ptn::lit(48) >> 48,
-              ptn::lit(49) >> 49,
-              ptn::lit(50) >> 50,
-              ptn::lit(51) >> 51,
-              ptn::lit(52) >> 52,
-              ptn::lit(53) >> 53,
-              ptn::lit(54) >> 54,
-              ptn::lit(55) >> 55,
-              ptn::lit(56) >> 56,
-              ptn::lit(57) >> 57,
-              ptn::lit(58) >> 58,
-              ptn::lit(59) >> 59,
-              ptn::lit(60) >> 60,
-              ptn::lit(61) >> 61,
-              ptn::lit(62) >> 62,
-              ptn::lit(63) >> 63,
-              _ >> 0);
-}
-
-static_assert(ct_lit_64(0) == 0, "");
-static_assert(ct_lit_64(32) == 32, "");
-static_assert(ct_lit_64(63) == 63, "");
-static_assert(ct_lit_64(-1) == 0, "");
-static_assert(ct_lit_64(64) == 0, "");
diff --git a/bench/compile-time/ct_bench_lit_8.cpp b/bench/compile-time/ct_bench_lit_8.cpp
deleted file mode 100644
index fdfad30..0000000
--- a/bench/compile-time/ct_bench_lit_8.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-// compile-time literal-match benchmark – forces full instantiation
-// of the match-dispatch machinery with 8 literal cases.
-
-#include "ptn/patternia.hpp"
-
-constexpr int ct_lit_8(int v) noexcept {
-  using namespace ptn;
-  return match(v)
-         | on(ptn::lit(0) >> 0,
-              ptn::lit(1) >> 1,
-              ptn::lit(2) >> 2,
-              ptn::lit(3) >> 3,
-              ptn::lit(4) >> 4,
-              ptn::lit(5) >> 5,
-              ptn::lit(6) >> 6,
-              ptn::lit(7) >> 7,
-              _ >> 0);
-}
-
-static_assert(ct_lit_8(0) == 0, "");
-static_assert(ct_lit_8(4) == 4, "");
-static_assert(ct_lit_8(7) == 7, "");
-static_assert(ct_lit_8(-1) == 0, "");
-static_assert(ct_lit_8(8) == 0, "");