[ruby/prism] Fix the implementation of the flag on keyword hash nodes

The previous implementation was incorrect since it was just checking for all keys in assoc nodes to be static literals but the actual check is that all keys in assoc nodes must be symbol nodes.

This commit fixes that implementation, and, also, aliases the flag to `PM_KEYWORD_HASH_NODE_FLAGS_SYMBOL_KEYS` so that ruby/ruby can start using the new flag name.

I intend to later change the real flag name to `PM_KEYWORD_HASH_NODE_FLAGS_SYMBOL_KEYS` and remove the alias.

ruby/prism@f5099c79ce

prism/parser.h

@@ -17,6 +17,12 @@
 
 #include <stdbool.h>
 
+// TODO: remove this by renaming the original flag
+/**
+ * Temporary alias for the PM_NODE_FLAG_STATIC_KEYS flag.
+ */
+#define PM_KEYWORD_HASH_NODE_FLAGS_SYMBOL_KEYS PM_KEYWORD_HASH_NODE_FLAGS_STATIC_KEYS
+
 /**
  * This enum provides various bits that represent different kinds of states that
  * the lexer can track. This is used to determine which kind of token to return

prism/prism.c

@@ -3949,7 +3949,7 @@ pm_keyword_hash_node_create(pm_parser_t *parser) {
         .base = {
             .type = PM_KEYWORD_HASH_NODE,
             .location = PM_OPTIONAL_LOCATION_NOT_PROVIDED_VALUE,
-            .flags = PM_KEYWORD_HASH_NODE_FLAGS_STATIC_KEYS
+            .flags = PM_KEYWORD_HASH_NODE_FLAGS_SYMBOL_KEYS
         },
         .elements = { 0 }
     };
@@ -3962,10 +3962,11 @@ pm_keyword_hash_node_create(pm_parser_t *parser) {
  */
 static void
 pm_keyword_hash_node_elements_append(pm_keyword_hash_node_t *hash, pm_node_t *element) {
-    // If the element being added is not an AssocNode or does not have a static literal key, then
+    // If the element being added is not an AssocNode or does not have a symbol key, then
     // we want to turn the STATIC_KEYS flag off.
-    if (!PM_NODE_TYPE_P(element, PM_ASSOC_NODE) || !PM_NODE_FLAG_P(((pm_assoc_node_t *) element)->key, PM_NODE_FLAG_STATIC_LITERAL)) {
-        pm_node_flag_unset((pm_node_t *)hash, PM_KEYWORD_HASH_NODE_FLAGS_STATIC_KEYS);
+    // TODO: Rename the flag to SYMBOL_KEYS instead.
+    if (!PM_NODE_TYPE_P(element, PM_ASSOC_NODE) || !PM_NODE_TYPE_P(((pm_assoc_node_t *) element)->key, PM_SYMBOL_NODE)) {
+        pm_node_flag_unset((pm_node_t *)hash, PM_KEYWORD_HASH_NODE_FLAGS_SYMBOL_KEYS);
     }
 
     pm_node_list_append(&hash->elements, element);

test/prism/snapshots/seattlerb/aref_args_assocs.txt

@@ -7,7 +7,7 @@
             ├── flags: ∅
             ├── elements: (length: 1)
             │   └── @ KeywordHashNode (location: (1,1)-(1,7))
-            │       ├── flags: static_keys
+            │       ├── flags: ∅
             │       └── elements: (length: 1)
             │           └── @ AssocNode (location: (1,1)-(1,7))
             │               ├── key:

test/prism/snapshots/seattlerb/aref_args_lit_assocs.txt

@@ -9,7 +9,7 @@
             │   ├── @ IntegerNode (location: (1,1)-(1,2))
             │   │   └── flags: decimal
             │   └── @ KeywordHashNode (location: (1,4)-(1,10))
-            │       ├── flags: static_keys
+            │       ├── flags: ∅
             │       └── elements: (length: 1)
             │           └── @ AssocNode (location: (1,4)-(1,10))
             │               ├── key:

test/prism/snapshots/seattlerb/call_arg_assoc.txt

@@ -17,7 +17,7 @@
             │       ├── @ IntegerNode (location: (1,2)-(1,3))
             │       │   └── flags: decimal
             │       └── @ KeywordHashNode (location: (1,5)-(1,9))
-            │           ├── flags: static_keys
+            │           ├── flags: ∅
             │           └── elements: (length: 1)
             │               └── @ AssocNode (location: (1,5)-(1,9))
             │                   ├── key:

test/prism/snapshots/seattlerb/call_args_assoc_trailing_comma.txt

@@ -17,7 +17,7 @@
             │       ├── @ IntegerNode (location: (1,2)-(1,3))
             │       │   └── flags: decimal
             │       └── @ KeywordHashNode (location: (1,5)-(1,9))
-            │           ├── flags: static_keys
+            │           ├── flags: ∅
             │           └── elements: (length: 1)
             │               └── @ AssocNode (location: (1,5)-(1,9))
             │                   ├── key:

test/prism/snapshots/seattlerb/call_assoc.txt

@@ -15,7 +15,7 @@
             │   ├── flags: ∅
             │   └── arguments: (length: 1)
             │       └── @ KeywordHashNode (location: (1,2)-(1,6))
-            │           ├── flags: static_keys
+            │           ├── flags: ∅
             │           └── elements: (length: 1)
             │               └── @ AssocNode (location: (1,2)-(1,6))
             │                   ├── key:

test/prism/snapshots/seattlerb/call_assoc_trailing_comma.txt

@@ -15,7 +15,7 @@
             │   ├── flags: ∅
             │   └── arguments: (length: 1)
             │       └── @ KeywordHashNode (location: (1,2)-(1,6))
-            │           ├── flags: static_keys
+            │           ├── flags: ∅
             │           └── elements: (length: 1)
             │               └── @ AssocNode (location: (1,2)-(1,6))
             │                   ├── key:

test/prism/snapshots/seattlerb/method_call_assoc_trailing_comma.txt

@@ -25,7 +25,7 @@
             │   ├── flags: ∅
             │   └── arguments: (length: 1)
             │       └── @ KeywordHashNode (location: (1,4)-(1,8))
-            │           ├── flags: static_keys
+            │           ├── flags: ∅
             │           └── elements: (length: 1)
             │               └── @ AssocNode (location: (1,4)-(1,8))
             │                   ├── key:

test/prism/snapshots/seattlerb/parse_opt_call_args_assocs_comma.txt

@@ -17,7 +17,7 @@
             │   ├── flags: ∅
             │   └── arguments: (length: 1)
             │       └── @ KeywordHashNode (location: (1,2)-(1,6))
-            │           ├── flags: static_keys
+            │           ├── flags: ∅
             │           └── elements: (length: 1)
             │               └── @ AssocNode (location: (1,2)-(1,6))
             │                   ├── key:

test/prism/snapshots/whitequark/array_assocs.txt

@@ -7,7 +7,7 @@
         │   ├── flags: ∅
         │   ├── elements: (length: 1)
         │   │   └── @ KeywordHashNode (location: (1,2)-(1,8))
-        │   │       ├── flags: static_keys
+        │   │       ├── flags: ∅
         │   │       └── elements: (length: 1)
         │   │           └── @ AssocNode (location: (1,2)-(1,8))
         │   │               ├── key:
@@ -25,7 +25,7 @@
             │   ├── @ IntegerNode (location: (3,2)-(3,3))
             │   │   └── flags: decimal
             │   └── @ KeywordHashNode (location: (3,5)-(3,11))
-            │       ├── flags: static_keys
+            │       ├── flags: ∅
             │       └── elements: (length: 1)
             │           └── @ AssocNode (location: (3,5)-(3,11))
             │               ├── key: