Fix various clang-tidy lints

* some things that can throw are marked noexcept
  yet the linter seems to think not. Maybe they can't throw in practice.
  I would rather not have the UB possibility in pretty obvious cold
  paths.
* various default-case-missing complaints
* a fair pile of casts from integer to character, which are in fact
  deliberate.
* an instance of <https://clang.llvm.org/extra/clang-tidy/checks/bugprone/move-forwarding-reference.html>
* bugprone-not-null-terminated-result on handing a string to curl in
  chunks of bytes. our usage is fine.
* reassigning a unique_ptr by CRIMES instead of using release(), then
  using release() and ignoring the result. wild. let's use release() for
  its intended purpose.

Change-Id: Ic3e7affef12383576213a8a7c8145c27e662513d

3 files changed, 20 insertions, 17 deletions

diff --git a/tests/unit/libstore-support/tests/path.cc b/tests/unit/libstore-support/tests/path.cc
index 8bf501ab6..ffc4fc607 100644
--- a/tests/unit/libstore-support/tests/path.cc
+++ b/tests/unit/libstore-support/tests/path.cc
@@ -32,13 +32,13 @@ Gen<StorePathName> Arbitrary<StorePathName>::arbitrary()
     for (size_t c = 0; c < len; ++c) {
         switch (auto i = *gen::inRange<uint8_t>(0, 10 + 2 * 26 + 6)) {
             case 0 ... 9:
-                pre += '0' + i;
+                pre += static_cast<uint8_t>('0' + i);
                 break;
             case 10 ... 35:
-                pre += 'A' + (i - 10);
+                pre += static_cast<uint8_t>('A' + (i - 10));
                 break;
             case 36 ... 61:
-                pre += 'a' + (i - 36);
+                pre += static_cast<uint8_t>('a' + (i - 36));
                 break;
             case 62:
                 pre += '+';
diff --git a/tests/unit/libstore/outputs-spec.cc b/tests/unit/libstore/outputs-spec.cc
index 63cde681b..72a7da974 100644
--- a/tests/unit/libstore/outputs-spec.cc
+++ b/tests/unit/libstore/outputs-spec.cc
@@ -170,20 +170,22 @@ TEST(ExtendedOutputsSpec, many_carrot) {
 }
 
 
-#define TEST_JSON(TYPE, NAME, STR, VAL)                    \
-                                                           \
-    TEST(TYPE, NAME ## _to_json) {                         \
-        using nlohmann::literals::operator "" _json;       \
-        ASSERT_EQ(                                         \
-            STR ## _json,                                  \
-            ((nlohmann::json) TYPE { VAL }));              \
-    }                                                      \
-                                                           \
-    TEST(TYPE, NAME ## _from_json) {                       \
-        using nlohmann::literals::operator "" _json;       \
-        ASSERT_EQ(                                         \
-            TYPE { VAL },                                  \
-            (STR ## _json).get<TYPE>());                   \
+#define TEST_JSON(TYPE, NAME, STR, VAL)                      \
+                                                             \
+    TEST(TYPE, NAME ## _to_json) {                           \
+        using nlohmann::literals::operator "" _json;         \
+        ASSERT_EQ(                                           \
+            STR ## _json,                                    \
+            /* NOLINTNEXTLINE(bugprone-macro-parentheses) */ \
+            ((nlohmann::json) TYPE { VAL }));                \
+    }                                                        \
+                                                             \
+    TEST(TYPE, NAME ## _from_json) {                         \
+        using nlohmann::literals::operator "" _json;         \
+        ASSERT_EQ(                                           \
+            /* NOLINTNEXTLINE(bugprone-macro-parentheses) */ \
+            TYPE { VAL },                                    \
+            (STR ## _json).get<TYPE>());                     \
     }
 
 TEST_JSON(OutputsSpec, all, R"(["*"])", OutputsSpec::All { })
diff --git a/tests/unit/libutil-support/tests/terminal-code-eater.cc b/tests/unit/libutil-support/tests/terminal-code-eater.cc
index ad05ed1f6..6e108009a 100644
--- a/tests/unit/libutil-support/tests/terminal-code-eater.cc
+++ b/tests/unit/libutil-support/tests/terminal-code-eater.cc
@@ -26,6 +26,7 @@ void TerminalCodeEater::feed(char c, std::function<void(char)> on_char)
         // Just eat \r, since it is part of clearing a line
         case '\r':
             return;
+        default: break;
         }
         if constexpr (DEBUG_EATER) {
             std::cerr << "eater uneat" << MaybeHexEscapedChar{c} << "\n";